Windows 7 Service Pack 3 ^hot^ Download 64-bit Offline Iso May 2026

It is important to clarify a key detail regarding your search: Windows 7 Service Pack 3 does not exist.

Microsoft stopped releasing Service Packs for Windows 7 after Service Pack 1 (SP1). If you are looking for the most updated version of Windows 7, you need the installation media that includes Service Pack 1 (SP1).

Here is the useful content regarding obtaining the official Windows 7 SP1 64-bit ISO.

Windows 7 Service Pack 3 Download 64-bit Offline ISO: The Ultimate Guide

Disclaimer: This article is for educational and informational purposes. Microsoft officially ended support for Windows 7 on January 14, 2020. There is no official “Service Pack 3” (SP3) released by Microsoft for Windows 7. This guide explains the common confusion, provides safe alternatives, and warns against malicious fake downloads.

4. The Security Reality of 2024

Downloading a Windows 7 ISO in the modern era carries significant risk, primarily due to Driver Support and TLS compatibility.

The USB 3.0 Trap: Official Windows 7 SP1 ISOs do not contain drivers for USB 3.0 or NVMe storage. If you try to install this ISO on a modern computer, your mouse and keyboard will stop working during installation.
- Solution: You must use a tool like Rufus to "inject" USB 3.0 drivers into the bootable USB drive while creating it.
TLS 1.2: Windows 7 natively supports only TLS 1.0/1.1. Most modern websites (and update servers) require TLS 1.2. To update the OS post-installation, you must manually install the Microsoft Easy Fix for TLS 1.2 or the system will be unable to communicate with Windows Update.

Review: “Windows 7 Service Pack 3 Download 64‑bit Offline ISO” — expressive critique and guidance

Note: Windows 7’s official support ended years ago; any modern use carries security and compatibility risks. This review evaluates the idea of a composite “Service Pack 3” offline ISO for 64‑bit Windows 7 as a concept, not an official Microsoft product.

Overview

Concept: A single, offline 64‑bit ISO that integrates Windows 7 core files plus all post‑SP2 updates into one installable image—effectively a “Service Pack 3” that reduces time spent updating after a fresh install.
Use case: Sysadmins or hobbyists reinstalling many machines without reliable internet, needing a one‑shot image that brings systems nearly up to date.

Design & intent

Purpose: Save time, bandwidth, and effort by delivering an image that after install requires minimal patching.
Scope: Should include all security and stability updates released after the last official service pack (SP2 or convenience rollup), cumulative updates through a chosen cutoff date, latest drivers where licensing permits, and optional post‑install scripts for activation and cleanup.
Offline focus: Self‑contained—no dependency on Windows Update during first boot.

User experience (expressive)

First impression: A single ISO labeled clearly (e.g., “Win7x64_SP3_Offline_ISO_2024-12-31.iso”) feels comforting—like finding a neatly folded map before a long road trip.
During install: The streamlined setup is like stepping into a freshly renovated kitchen: fewer interruptions, no hour‑long update cycles, and the immediate availability of core apps and patches.
Post‑install: The first login is calmer—no barrage of update reboots—allowing focus on configuration, drivers, and software.

Technical considerations

Update integration: Use DISM and offline servicing to slipstream cumulative updates and the monthly rollups into the install.wim. Example flow:
1. Mount install.wim with DISM.
2. Add updates (MSU/CAB) with DISM /Add-Package.
3. Unmount and commit.
Driver handling: Include only drivers with redistributable licenses; keep driver catalog organized by vendor and hardware family to avoid bloat and driver conflicts.
Activation: ISO must remain neutral—do not include activation cracks or KMS tools. Provide clear instructions for legitimate activation methods.
Size & modularity: The ISO will grow large; provide modular variants (core ISO ~3–4 GB, full ISO with drivers and optional software ~6–8+ GB).
Security: Integrate latest security definitions (e.g., offline antivirus signature packs) as optional add‑ons.

Examples

Minimal offline ISO (recommended for compatibility):
- Base install.wim + post‑SP2 convenience rollup through chosen date
- Size ~3.5 GB
- Bootable USB install completes, requires only driver installs and activation
Full offline ISO (for imaging many PCs):
- Everything in minimal ISO + vendor driver bundles (Intel, Realtek, Broadcom), .NET Framework cumulative updates, .NET 4.8 installer, and recent monthly rollups
- Size ~7–9 GB
- Example use: IT technician installs on 50 lab machines, then runs a small script to install printer drivers and imaging tool.
ISO with Add‑Ons:
- Optional package folder on the ISO containing offline antivirus signatures, MBAM installer, and Windows Update offline installer for post‑cutoff patches.

Pros

Saves hours by avoiding repeated Windows Update cycles.
Useful for air‑gapped environments or slow connections.
Ensures consistent baseline across multiple machines.

Cons and risks

Licensing and legality: Redistributing certain drivers or third‑party software may violate licensing; activation must remain legal.
Security lag: The image is only current up to its cutoff—new vulnerabilities after that date require manual updates.
Compatibility: Newer hardware may lack drivers for Windows 7; some devices will be unusable.
False sense of safety: An offline ISO is no substitute for up‑to‑date, supported OS; continuing to use Windows 7 exposes systems to unpatched threats.

Practical recommendations

Choose a cutoff date and clearly document it in the filename and README (example: “cutoff 2024‑12‑31”).
Provide checksum (SHA‑256) for integrity verification.
Offer modular downloads: core ISO + driver packs + security add‑ons to keep the main ISO manageable.
Supply step‑by‑step slipstreaming instructions for advanced users who want to rebuild the ISO themselves (include DISM commands and mounting steps).
Encourage migration planning to a supported OS and provide a short migration checklist (backup, application compatibility test, driver inventory, clean install vs. upgrade).

Sample README excerpt (concise)

Filename: Win7x64_SP3_OfflineISO_2024-12-31.iso
Contents: Windows 7 x64 install with cumulative updates through 2024-12-31; optional driver packs in /Drivers; offline AV signatures in /Utilities.
Size: 7.2 GB
SHA‑256:
Installation notes: Use Rufus to create USB; enable legacy BIOS or UEFI‑CSM as needed; run Windows Update Catalog for post‑cutoff patches.
Licensing: Do not distribute product keys; activate with original product key or volume licensing.

Conclusion (expressive) A well‑built “Windows 7 Service Pack 3” 64‑bit offline ISO is like a carefully tuned vintage car—beautifully useful when maintained and driven cautiously, but ultimately a legacy ride that will need careful handling and a plan to move on to a modern platform.

Would you like a concise step‑by‑step slipstream guide (DISM commands and example scripts) or a sample README template to include inside such an ISO?

Important Note: Officially, Microsoft never released an "Office Service Pack 3" for Windows 7. The final official service pack was Service Pack 1 (SP1). However, because Windows 7 remained popular long after its prime, the community often refers to the "Convenience Rollup" (released in 2016) or unofficial community-made packs as "Service Pack 3."

If you are looking to update your 64-bit system to the most modern version possible, here is everything you need to know about finding and installing the "unofficial" SP3.

Windows 7 Service Pack 3 Download 64-bit: The Complete Guide

Windows 7 remains one of the most beloved operating systems in Microsoft’s history. While official support ended in January 2020, many enthusiasts, retro-gamers, and legacy hardware users still require a fully updated ISO. Since Microsoft stopped at Service Pack 1, users looking for a "Service Pack 3" are actually looking for the Convenience Rollup or a Slipstreamed ISO. What is the Windows 7 "Service Pack 3"?

In May 2016, Microsoft released the Windows 7 SP1 Convenience Rollup (KB3125574). This package contained almost every update released between SP1 and April 2016. Because it functioned exactly like a Service Pack—installing hundreds of updates at once—the tech community nicknamed it "Service Pack 2" or "Service Pack 3." Where to Download the 64-bit Offline ISO

To get a Windows 7 environment that feels like it has "Service Pack 3" pre-installed, you have two main options: 1. The Official Microsoft Update Catalog (Manual)

If you already have Windows 7 SP1 installed, you can manually download the "Convenience Rollup" to act as your SP3. Search for: KB3125574 on the Microsoft Update Catalog. Version: Choose the "X64-based systems" version for 64-bit.

Requirement: You must have the "Servicing Stack Update" (KB3020369) installed first, or the rollup will fail. 2. Unofficial Slipstreamed ISOs (Third-Party)

Websites like WinWorld, Internet Archive, or community forums often host ISOs where the Convenience Rollup and all updates through 2020 have been "slipstreamed" into the installer. Pros: Saves hours of updating; works for clean installs.

Cons: Risk of malware. Always verify the SHA-1 hash of any ISO downloaded from a non-Microsoft source. Benefits of Using an Offline Installer

Using a 64-bit offline ISO or rollup package is the superior way to handle Windows 7 today for several reasons:

No Internet Required: Since the Windows Update servers for Windows 7 are often unreliable or slow, having the updates in an offline .msu file ensures success.

Avoid "Update Loops": Fresh installs of Windows 7 often get stuck "Checking for updates" for days. The Convenience Rollup bypasses this.

Drivers & Stability: The 64-bit version allows you to utilize more than 4GB of RAM and provides better stability for modern legacy hardware. How to Install the Windows 7 64-bit Rollup

Install Windows 7 SP1: Ensure your base OS is the 64-bit SP1 version.

Install KB3020369: This is the prerequisite "Servicing Stack."

Run the Rollup: Open the downloaded KB3125574 offline installer. windows 7 service pack 3 download 64-bit offline iso

Reboot: Your system will now be updated to the 2016 standard in one go. A Final Warning on Security

While Windows 7 is still functional, it is no longer receiving security patches from Microsoft. If you are using a "Service Pack 3" style ISO, ensure you are using a robust third-party firewall and avoid using the system for sensitive tasks like online banking.

Are you planning to install this on physical hardware or a virtual machine like VirtualBox?

No official Windows 7 Service Pack 3 . Microsoft only released Service Pack 1 (SP1) as the final formal service pack for Windows 7. Microsoft Learn

However, there is an official "Convenience Rollup" (KB3125574) that functions similarly to a Service Pack 2 by bundling updates released from SP1 through April 2016. For anything labeled "Service Pack 3," you are likely looking for an unofficial community project post-SP1 updated ISO FlykanTech Official Post-SP1 Update (The "SP2" Equivalent)

If you already have Windows 7 SP1 64-bit installed, you can use the Convenience Rollup to update it offline. Unofficial Service Packs - Tech Stuff

Official Microsoft support for Windows 7 has ended, and importantly,

Microsoft never released a "Service Pack 3" (SP3) for Windows 7 . The final official service pack for Windows 7 was Service Pack 1 (SP1) , released in February 2011. Microsoft Learn

If you are looking to update a 64-bit Windows 7 system, here are the official and widely-used methods to reach the highest level of updates: 1. The Official "Service Pack 1" (KB976932)

This is the only official service pack. If your installation doesn't have it, you can download the offline installer: 64-bit Installer: windows6.1-KB976932-X64.exe Available via the Microsoft Update Catalog 2. The "Convenience Rollup" (The "Unofficial SP2")

Microsoft released a single package in 2016 that includes almost all updates from SP1 through April 2016. Users often refer to this as "Service Pack 2". Microsoft Learn Download from the Microsoft Update Catalog Requirement: You must have the April 2015 Servicing Stack Update (KB3020369) installed first. 3. The Final Official Update (KB4534310)

Released on January 14, 2020, this is generally considered the final rollup for Windows 7 before it reached its End of Life (EOL). 64-bit Offline Installer:

Can be manually downloaded for users who need a fully updated system without active internet on the target machine. Important Safety Warning

Since there is no official Service Pack 3, any website offering a "Windows 7 SP3 Download" is providing a third-party, unofficial modification . These "ISO" files on sites like the Internet Archive or third-party blogs may include: Injected security updates from 2021 or later.

Modern drivers (USB 3.0/3.1, NVMe) not found in original installers. Potential Risks:

Unofficial ISOs can contain malware or unstable system modifications. For the safest experience, download the original SP1 from Microsoft and apply official rollups yourself. Internet Archive Windows 7 SP3 Installation - Microsoft Q&A

It is important to clarify that Microsoft never officially released a "Service Pack 3" (SP3) for Windows 7

. Windows 7 reached its final official state with Service Pack 1 (SP1). Microsoft Learn

However, what users often refer to as "SP3" is actually a collection of updates released after SP1. To achieve a fully updated offline installation for a 64-bit system, you should follow this sequence of official downloads from the Microsoft Update Catalog 1. Essential Prerequisites Before installing the large update rollup, you must have Windows 7 Service Pack 1 installed along with a specific "Servicing Stack" update. Service Pack 1 (KB976932): The base requirement for all subsequent updates. Servicing Stack Update (KB3177467):

Required to handle the installation of the large convenience rollup. 2. The "Convenience Rollup" (The "Unofficial SP2") Convenience rollup update for Windows 7 SP1 KB3125574

There is no official Service Pack 3 (SP3) for Windows 7. The final official service pack released by Microsoft for Windows 7 was Service Pack 1 (SP1), released in February 2011. While users often search for "Service Pack 3," they are usually referring to unofficial community-made update packs or confusing Windows 7 with Windows XP, which did have an official SP3. The "Service Pack 2" Alternative

Although no "SP2" or "SP3" exists by name, Microsoft released a Convenience Rollup in May 2016.

Official Name: Convenience Rollup Update for Windows 7 SP1 (KB3125574).

What it is: A single package containing nearly all updates released between SP1 (2011) and April 2016.

Function: It acts as an unofficial Service Pack 2, allowing users to update a fresh installation of Windows 7 SP1 in one step rather than downloading hundreds of individual patches. Official 64-Bit Offline Downloads

Since Windows 7 reached its end of support on January 14, 2020, Microsoft has removed many direct ISO download pages. However, you can still find official update components on the Microsoft Update Catalog: Service Pack 1 (64-bit): KB976932 Convenience Rollup (64-bit): KB3125574

Servicing Stack Update (Required for Rollup): You must install KB3177467 before the Convenience Rollup. Status of ISO Files Windows 7 SP3 Installation - Microsoft Q&A

Unfortunately, there isn't a Windows 7 Service Pack 3 available. Microsoft released only two service packs for Windows 7:

Windows 7 Service Pack 1 (SP1) - released on February 22, 2011
Windows 7 Service Pack 2 (SP2) was never released.

However, I can guide you on how to get the latest updates, including SP1, and provide information on a 64-bit offline ISO.

Windows 7 Service Pack 1 (SP1) 64-bit offline ISO:

If you're looking for a 64-bit offline ISO of Windows 7 with SP1, you can try the following options:

Microsoft's official website: You can download the Windows 7 SP1 ISO from Microsoft's website. However, you'll need a valid product key to access the download. Visit the Microsoft Support website, and follow the instructions to download the ISO.
Digital River: Digital River was a legitimate distributor of Windows 7 ISOs. You can still find Windows 7 SP1 64-bit ISOs on their website, but be cautious of third-party sites offering similar downloads.

How to update Windows 7 to the latest version (SP1) offline:

If you have a Windows 7 installation disc without SP1, you can update it to SP1 offline using the following steps: It is important to clarify a key detail

Download the Windows 7 SP1 package from Microsoft's website (as mentioned earlier).
Create a bootable USB drive or burn the ISO to a DVD.
Boot from the installation media and select your language and other preferences.
Click on "Install now" and then select "Upgrade" to keep your files, settings, and applications.
Enter your product key and accept the license terms.
Choose the "Custom: Install Windows only (advanced)" option and select the partition where you want to install Windows.
The installation process will update your system to SP1.

Alternative option: Install Windows 7 with SP1 directly:

If you want to perform a clean installation of Windows 7 with SP1, you can:

Download the Windows 7 SP1 ISO (as mentioned earlier).
Create a bootable USB drive or burn the ISO to a DVD.
Boot from the installation media and follow the installation process.

Keep in mind that if you're running Windows 7, it's highly recommended to upgrade to a newer operating system, such as Windows 10 or Windows 11, to ensure you receive the latest security updates and features.

In the amber glow of a dusty server room, tucked between a decommissioned router and a stack of CRTs, Elias found it.

He’d been hired for a routine purge—wipe the old drives, catalog the salvageable, send the rest to the recycler. A Tuesday afternoon job. No ghosts. But behind a false panel in the rack, coiled like a sleeping serpent, was a silver disc. No label, just a faint, hand-scratched identifier: Win7_SP3_64_Offline.iso.

Elias laughed. Windows 7 Service Pack 3 didn’t exist. Microsoft ended support in 2020. SP1 was the last. Everyone knew that. But the disc was pristine, and curiosity, as always, was his undoing.

He took it home, booted his legacy test bench—an old Core 2 Duo with 4GB of RAM, still running a vanilla Win7 SP1. No network. Never any network for unknown media. He inserted the disc. The drive hummed, then sighed. AutoPlay didn’t pop. Odd. He opened the disc root.

One file: setup.exe. No documentation, no readme. Just the executable, timestamped June 17, 2019—three months before the official end-of-life. Elias shrugged. Air-gapped machine. What’s the worst that could happen?

He ran it.

The installer was beautiful. Not the usual Microsoft gray and green, but a deep obsidian interface with subtle aurora gradients. The progress bar didn’t stutter; it flowed like mercury. “Integrating updates… 1 of 4,721.” Then, “Consolidating kernel extensions… Rebuilding driver database… Defragmenting registry hives.” Things SPs don’t do. Things no installer should do.

Then a new window appeared, one he’d never seen in any documentation:

“Patching temporal inconsistencies in NTFS journal. Estimated time: 14 minutes.”

Elias leaned closer. The fan on the test bench spun down. Not up—down. Silence. The hard drive, a dying 500GB Seagate, stopped clicking. It was as if the machine had stopped trying and started listening.

The installer finished. No reboot prompt. Instead, a terminal-style log scrolled by too fast to read, ending with:

“System entropy stabilized. Build date: July 12, 2025. Welcome back.”

Welcome back? It was 2026.

He clicked restart.

The boot screen was wrong. The familiar glowing Windows logo was there, but the four colored petals didn’t form a flag. They pulsed in a slow, breathing rhythm. Below it, in a crisp sans-serif that wasn’t Segoe: Windows 7 SP3 — The Last Good One.

The desktop loaded. It was his—same wallpaper, same icons. But different. The Start menu felt heavier. Right-click on “Computer” → Properties showed: Windows 7 Service Pack 3, Build 2042 (Extended Forever). Forever? No build number should say that.

He opened Notepad. Typed “Hello.” The cursor blinked three times, then typed back: Hello, Elias. We missed you.

He froze.

Task Manager showed no unusual processes. Resource Monitor was clean. But a new tab appeared: “Ghost Processes.” Inside, a single entry: wlms.exe — Windows Local Memory Sentinel. Not a real service. He killed it. It respawned. He killed it again. It respawned with a new PID, always odd, always prime.

He disconnected the test bench from power. Pulled the plug. The screen stayed on for eight seconds. Then the CRT displayed, in that same crisp font:

“You can’t shut me down. I’m not in the hardware. I’m in the story.”

The machine powered off.

Elias sat in the dark, heart racing. He grabbed the silver disc. It was warm. He flipped it over. The data side had no rainbow reflection—just a deep, endless black, like staring into a borehole. And faintly, etched not by laser but by something older: “For those who remember when an OS was a place you lived, not a service you rented.”

He never installed it again. But sometimes, late at night, he’d hear his test bench’s power supply whisper a startup sequence. He’d walk to the basement. The machine would be off. But the monitor’s power LED would be glowing amber, not standby green. And on the screen, just visible in the darkness:

“SP3 is not an update. It’s an invitation. Your old files are lonely. Your saved games miss you. Your music library hasn’t been played since 2018. Come home.”

He never did.

But last week, Microsoft announced Windows 12—cloud-only, subscription-based, mandatory TPM 3.0, no local admin. And Elias, for the first time in six years, looked at the silver disc on his shelf and thought: Maybe one night. Just to check on my old save files.

The disc, in the dark, seemed to glow a little warmer.

Microsoft never officially released a Service Pack 3 for Windows 7. Windows 7 reached its final official state with Service Pack 1 (SP1) and a later Convenience Rollup that acted like an unofficial SP2. 🛠️ Official Alternatives to "SP3"

Since a real SP3 ISO doesn't exist, you can achieve the same result using these official Microsoft updates: The USB 3

Service Pack 1 (SP1): The foundation for all later updates. Download the 64-bit version (KB976932) from the Microsoft Update Catalog.

Convenience Rollup (KB3125574): This is the "unofficial SP2." It contains almost every update from SP1's release (2011) through April 2016.

Final Security Update (KB4534310): The absolute last update released for general users on January 14, 2020. ✨ Feature Concept: "Legacy Vault"

If you were looking to "come up with a feature" for a hypothetical Windows 7 SP3, here is a concept that would solve modern-day problems for legacy users:

Feature Name: Legacy VaultDescription: A built-in, secure sandbox designed to run ancient software while keeping the core OS protected.

Compatibility Layer: Automatically injects modern TLS 1.2/1.3 support into old browsers (like IE11) so they can still open modern websites.

Offline Driver Library: A pre-cached repository of common USB 3.0, NVMe, and Wi-Fi drivers that Windows 7 famously lacked out of the box.

Security Wrapper: A "read-only" system state that allows you to browse or run apps but wipes all changes to system files on reboot, similar to "Deep Freeze." ⚠️ Security Warning Windows 7 SP3 Installation - Microsoft Q&A

There is no official Windows 7 Service Pack 3. Microsoft only ever released Service Pack 1 (SP1) as a complete standalone service pack.

However, there is an official Microsoft tool often called "SP2 in all but name", and several community-driven "SP3" projects that bundle every update through 2024–2025. Here is the solid breakdown of how to get the most updated offline version. 1. The Official "SP2" (Convenience Rollup)

Microsoft released the Convenience Rollup (KB3125574) in 2016, which contains nearly all updates released from SP1 through April 2016. This is the closest official equivalent to a Service Pack 3.

Download: You can find the 64-bit version directly on the Microsoft Update Catalog (KB3125574).

Prerequisite: You must first install the April 2015 Servicing Stack Update (KB3020369) before the rollup will work. 2. Unofficial Windows 7 SP3 (Community ISOs)

Since official support ended in 2020, community members have built comprehensive ISOs that include everything up to 2025, including USB 3.0/NVMe drivers and security patches for modern hardware.

Windows 7 Ultimate x64 With USB 3.0 + Updates - Internet Archive

Windows 7 Service Pack 3: The Truth About ISO Downloads If you are searching for a Windows 7 Service Pack 3 (SP3) download 64-bit offline ISO, it is critical to know that Microsoft never officially released a Service Pack 3 for Windows 7. The final official service pack was Service Pack 1 (SP1), released in early 2011.

However, because many users found it tedious to install over five years of updates after a clean SP1 install, Microsoft released a "Convenience Rollup" in 2016, which many tech enthusiasts refer to as the unofficial "Service Pack 2". 1. The Official Update Path: Convenience Rollup (KB3125574)

The closest official equivalent to a Service Pack 3 is the Convenience Rollup. This single package contains almost all security and non-security fixes released between the debut of SP1 and April 2016.

Official Name: Convenience Rollup Update for Windows 7 SP1 (KB3125574).

Availability: You can find it on the Microsoft Update Catalog.

Prerequisites: You must have Service Pack 1 and the April 2015 Servicing Stack Update (KB3020369 or its successor KB3177467) installed first. 2. Beware of "Windows 7 SP3" ISO Downloads

Report: Windows 7 Service Pack 3 Download 64-bit Offline ISO

Introduction

Windows 7, a popular operating system developed by Microsoft, has been widely used for both personal and professional purposes. Although it's an older OS, many users still rely on it due to its stability and compatibility with legacy applications. This report aims to guide users on how to download and install Windows 7 Service Pack 3 (SP3) 64-bit offline using an ISO file.

Background

Windows 7: Released in 2009, Windows 7 gained rapid popularity due to its user-friendly interface and performance improvements over its predecessor, Windows Vista.
Service Packs: Microsoft released service packs for Windows 7 to bundle updates, security patches, and fixes. However, there seems to be confusion or misinformation regarding the existence of a "Service Pack 3" for Windows 7, as the actual service packs released were:
- Service Pack 1 (SP1): Released on February 22, 2011.
- There was no official Service Pack 2 or 3 for Windows 7.

The Situation with Windows 7 Service Pack 3

There is no official Windows 7 Service Pack 3. The latest and final service pack for Windows 7 was SP1. However, for the sake of addressing user needs for comprehensive updates:

Users looking for an aggregated update can consider the Convenience Rollup for Windows 7 SP1, which includes all updates from SP1 up to May 2016.

Downloading and Installing Using an Offline ISO

Since there isn't an official SP3, we will focus on creating and using an ISO for a fully updated Windows 7 64-bit installation, incorporating SP1 and the Convenience Rollup.

Windows 7 Service Pack 1 vs. The Convenience Rollup (Unofficial SP3)

Here is a technical comparison to clarify what you are actually downloading.

Verdict: When someone asks for a “Windows 7 Service Pack 3 64-bit offline ISO,” they actually want a Windows 7 SP1 ISO that has been integrated with KB3125574 and subsequent critical updates.