If you own Fallout 4: Game of the Year Edition on GOG, since our version is directly compatible with Fallout: London, you will only have to follow these easy steps:
Install the English version of Fallout 4: GOTY Edition via GOG GALAXY and disable your cloud saves.
Get Fallout London in our store for free.
Install Fallout London via GOG GALAXY and launch it.
https://www.gog.com/en/game/fallout_4_game_of_the_year_edition
https://www.gog.com/en/game/fallout_london
If you own Fallout 4: Game of the Year Edition on GOG, since our version is directly compatible with Fallout: London, you will only have to follow these easy steps: