I owned Fallout 4 on Steam, but bought it on GOG a few months back in anticipation of this mod, and so glad I did. Installation for the GOG version was a breeze, and I was up and running quickly. As recommended by other I added Buffout 4 mod to stop some crashing. It still needs some cleanup, which is hardly surprising given it's only been released for two days. I'm sure the good folks who made this mod will keep patching it up. I'm a few hours in and enjoying the story, characters and London backdrop. Combat is harder than vanilla FO4, which is kind of nice, as vanilla combat gets trivial after awhile. A lot of attention has gone into this mod and it shows. I look forward to continuing to explore this new world.
