Here’s a step-by-step guide to install (version v1.02 – the iv233r7 appears to be a typo or local build ref, but the latest GOG-compatible version as of late 2024/early 2025 is 1.02 ) on the GOG version of Fallout 4.
: Launch the game once to allow it to create necessary configuration files and registry entries. Claim Fallout: London : Go to the Fallout: London GOG Store Page and add it to your library for free. Install Fallout: London Find "Fallout: London" in your GOG GALAXY library and click This will download the mod's standalone launcher. Launch & Apply Open the Fallout: London launcher. within the launcher. This process will modify your existing files to transform the game into Fallout: London Offline/Manual Installation