Installing .NET Framework 3.5 on modern systems like Windows 10 and Windows 11 is a common requirement for running older software and legacy applications. While Windows usually prompts for an internet-based download, you can use an offline installer or local installation media to complete the process without an active connection. Direct Download Links (Official)
The safest way to get the standalone installer is directly from Microsoft.
Microsoft .NET Framework 3.5 SP1 (Full Package) – This is the complete 231 MB redistributable package that does not require an internet connection during installation.
Microsoft .NET Framework 3.5 (Web Installer) – A smaller file (2.7 MB) that pulls necessary components from the web during setup. How to Install .NET 3.5 Offline via Command Prompt
If you have a Windows 10 or 11 ISO or USB installation drive, you can install the framework using the DISM (Deployment Image Servicing and Management) tool. This method is the most reliable for offline environments. Installing
Mount your Windows Media: Insert your USB or right-click your Windows ISO and select Mount. Note the drive letter (e.g., D:).
Open Command Prompt: Press the Windows key, type cmd, right-click it, and select Run as Administrator.
Run the DISM Command: Type or paste the following command, replacing D: with your actual drive letter:
Dism /online /enable-feature /featurename:NetFx3 /All /Source:D:\sources\sxs /LimitAccess Use code with caution. Method 3: Using the "NetFx3" Offline Installer Utility
Wait for Completion: The progress bar will reach 100%. Once finished, you may be prompted to restart your PC. Alternative: Using "Windows Features" (Internet Required)
If you are currently online and want the simplest method, follow these steps: Press Win + R, type optionalfeatures.exe, and hit Enter.
Check the box for .NET Framework 3.5 (includes .NET 2.0 and 3.0).
Click OK and select Let Windows Update download the files for you. Important Notes for Windows 11 Users Search for a reputable "
For the easiest user experience, many developers create small tools that bundle the necessary .cab files to install .NET 3.5 offline automatically.
.exe).D:).Microsoft provides a standalone (offline) installer for .NET Framework 3.5. However, note that even this "offline" installer may still try to download language packs from Windows Update. For a true offline installation on Windows 10/11, Method 2 is more reliable.
dotnetfx35.exe)Steps:
dotnetfx35.exe).Absolutely. It is a Microsoft redistributable component. Downloading it via ISO or DISM costs nothing.
If you are trying to run older software or games on Windows 10 or Windows 11, you may see an error asking for .NET Framework 3.5. While Microsoft usually tries to download this file from the internet (which can fail or be slow), you can install it offline using a built-in Windows tool.
Here is the official, free method to get the offline installer.