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The Fallout: London (v1.02) update, specifically for the GOG version, is widely considered the definitive way to play this massive total conversion mod. The current build (v1.02) focuses heavily on stability, performance optimization, and extensive bug fixes that weren't present at launch. Installation Experience

One-Click Convenience: For users who own Fallout 4: Game of the Year Edition on GOG, the installation is a "one-click" process through GOG Galaxy. It bypasses the complex downgrading required for the Steam version, as the GOG base game is already the compatible "last-gen" version.

Separate Instance: The GOG installer creates a standalone instance of the mod, allowing you to keep your vanilla Fallout 4 installation clean.

Essential Prep: You must ensure the High Resolution Texture Pack is not installed, as it causes stability issues with the mod. V1.02 Performance & Stability Improvements

The v1.02 patch is a "massive" update that addresses hundreds of issues reported by the community:

"Easiest Way to Install Fallout: London – GOG One-Click Edition"

Installing Fallout: London on GOG is generally more straightforward than on Steam because GOG’s version of Fallout 4: Game of the Year Edition is already at the correct version ( ) and does not require a downgrader. Prerequisites Fallout 4 GOTY Edition (GOG):

You must own the Game of the Year Edition or the base game with all DLCs on GOG. Storage Space: You need approximately

of free space (30 GB for the base game and ~34 GB for the mod). Cloud Saves: It is highly recommended to disable cloud saves

for Fallout 4 in GOG Galaxy to avoid configuration conflicts. Installation Steps

Subject: Installation Guide for Fallout: London v102iv233r7 (GOG Edition)

Abstract This document outlines the technical procedure for installing the Fallout: London total conversion mod, specifically targeting version build v102iv233r7 for the GOG distribution platform. Due to the mod’s requirement for the "Next-Gen" (Update 1.10.984) game engine, specific pre-installation steps are required for GOG users to ensure engine parity with Steam versions before the mod files are applied.

Prerequisites: What You Need Before You Start

To successfully perform the fallout london v102iv233r7 gog install, ensure you have the following:

  1. A legitimate GOG copy of Fallout 4 GOTY (Game of the Year Edition). The DLCs (Far Harbor, Nuka-World, Automatron, etc.) are mandatory. The mod will not launch without them.
  2. Fallout 4 version 1.10.163. This is the "pre-next-gen" build. The GOG launcher allows you to keep this version.
  3. The Fallout London v102iv233r7 installer. You can find this on the official Fallout London GOG page or Nexus Mods. The file size is approximately 18-20 GB.
  4. At least 80 GB of free hard drive space. (40 GB for Fallout 4 + 20 GB for London + 20 GB for backup/patches).
  5. GOG Galaxy (optional but recommended) for verifying file integrity.

2. ANALYSIS OF VERSION STRING "V102IV233R7"

Step 2: Downgrade Fallout 4 (Critical for GOG)

GOG’s Fallout 4 is often a different version than Fallout: London expects.
Use the Fallout 4 Downgrader (GOG-specific):

  1. Download the GOG Fallout 4 Downgrader from Nexus Mods or the FOLON Discord.
  2. Extract the tool into your Fallout 4 root folder (where Fallout4.exe lives).
  3. Run the downgrader as Administrator.
  4. Select the GOG version and target 1.10.163 (the version FOLON requires).
  5. Let it finish – it will replace executables and BA2 files.

Verify: After downgrade, right-click Fallout4.exe → Properties → Details – version should be 1.10.163.0.

Step 5: Post-Install Checks

  • Main menu should say “Fallout: London” instead of Fallout 4.
  • New game starts you on a train, not Vault 111.
  • If you see vanilla Commonwealth → installation failed (re-run downgrader + FOLON installer).

What is Fallout London v102iv233r7?

Before touching the installer, it is critical to understand what this string of text means.

  • Fallout London: A total conversion mod that moves the action from the American wasteland to a post-apocalyptic London, England. It features new voice acting, a new map, new weapons, and is roughly the size of Fallout 4’s base game.
  • v102iv233r7: This is a specific patch version number. As of this writing, the mod has seen rapid patching (v1.01, v1.02). The identifier "iv233r7" likely refers to a hotfix or a community-backed revision intended to stabilize the GOG version against crashes related to BA2 archives. Do not confuse this with the Steam version patches.
  • GOG Install: Unlike Steam, the GOG version of Fallout 4 is DRM-free and does not auto-update to the "Next-Gen" update unless you explicitly allow it. This is essential because Fallout London does NOT work with Fallout 4’s Next-Gen update (version 1.10.984+).

Step 3: Running the v102iv233r7 Installer

This is where the specific version string matters.

  1. Run as Administrator: Right-click Fallout_London_v102iv233r7.exe and select Run as Administrator. This prevents permission errors when writing to Program Files or GOG directories.
  2. Target Path: Point the installer to your Fallout 4 root folder (the same one you just cleaned). Do not point it to a subfolder called "London."
  3. Component Selection: The v102iv233r7 patch includes specific fixes for GOG:
    • Check the box: "GOG Compatibility Patch."
    • Uncheck: "Steam Workshop support" (if present).
    • Check: "High Resolution Textures (optional, only if you have a GPU with 8GB+ VRAM)."
  4. Installation Time: The process will take 20-40 minutes depending on your drive speed. It will extract roughly 5,000 new files.

The Ultimate Guide to Installing Fallout London (v102iv233r7) on GOG Galaxy

Fallout: London has arrived as one of the most ambitious mods in gaming history, effectively functioning as a full-scale sequel to Fallout 4. However, for fans who own the game on GOG.com (Good Old Games), the installation process—specifically for the niche patch version designated v102iv233r7—can be a labyrinth of compatibility patches, version conflicts, and manual file moving.

This guide provides a definitive, step-by-step walkthrough for installing Fallout London version v102iv233r7 onto your GOG copy of Fallout 4. We will cover prerequisites, the "next-gen" update nightmare, and exact file verification.

Option B – Manually downgrade

If you already have the next-gen version installed:

  1. Uninstall Fallout 4 via GOG Galaxy.
  2. Delete %LOCALAPPDATA%\Fallout4 and Documents\My Games\Fallout4.
  3. Reinstall using the Classic installer from GOG.