Under the "Download Offline Backup Game Installers" section, download all required

Mastering the Fallout: London v1.02iv233r7 GOG Installation Guide

Add the game to your library (it is free, but you must "purchase" it for $0.00). Step 2: Download the Installer

If everything is installed correctly, you will see a stylized, dark-themed Fallout: London main menu with custom music, replacing the familiar power armor garage interface. Troubleshooting Common v1.02 Issues

| Error Message | Solution | | :--- | :--- | | | You did not apply the iv233r7 hotfix. Re-do Step 4. | | "Missing Masters: ccBGSFO400 " * | The installer accidentally flagged Creation Club content. Open Fallout4Custom.ini and add sResourceArchive2List= (leave it blank). | | Infinite loading screen (Wheel spins forever) | Your version is wrong. Ensure you are on v1.10.163. GOG auto-updated? Re-do Step 1. | | Text is all "LOOKUP FAILED" | You have an English UI mod conflicting. Delete Interface folder in Data and re-verify the London BA2 archives. | | Game crashes on "New Game" at 15% | A classic memory spike. Go to Documents\My Games\Fallout4\Fallout4Prefs.ini and change uGridsToLoad=5 to uGridsToLoad=3 . |

You must own Fallout 4: Game of the Year Edition on GOG. The base game plus all official DLCs are strictly required.

Click the prominent button inside the launcher window.