As Fallout London is a modified version of Fallout 4, you might need to apply a crack or patch. Please note that:
This report outlines the installation and update details for Fallout: London
Installing on GOG is considered the "gold standard" for this mod because GOG Galaxy maintains the compatible "last-gen" version (1.10.163.0) of , removing the need for manual downgrading. Own the Correct Version : You must own Fallout 4: Game of the Year Edition or the base game with all DLCs on GOG. Install Fallout 4 GOG GALAXY to install the English version of Fallout 4: GOTY Edition
Installing on the GOG version of Fallout 4 is the most straightforward way to experience this massive total conversion mod, as the GOG release is inherently compatible with the mod's specific version requirements. Unlike the Steam version, which requires a manual downgrade to undo Bethesda's "Next-Gen" update, the GOG version of Fallout 4: GOTY Edition provides the necessary 1.10.163 files right out of the box. Preparation and Requirements
: Ensure you have approximately 65 GB of free space (30 GB for the base game and 34 GB for the mod). Step-by-Step GOG Installation Guide Installing FALLOUT: LONDON in One Click (GOG Version)
Additionally, you will need: