Fallout: London is a GOG-exclusive mod. Users are strongly advised to utilize the official GOG launcher or the Nexus Mods repository to ensure file integrity and version accuracy.
If you're downloading Fallout: London from GOG: fallout london v102iv233r7 gog install
: You must own Fallout 4: Game of the Year Edition or the base game with all official DLCs (excluding the High Resolution Texture Pack, which is optional). Fallout: London is a GOG-exclusive mod