So I initially had to manually install it on my Steam version of Fallout 4. Very longwinded way of installing it and I'm not a some nube when it comes to either PC Games or IT related issues. Finally manged to get it working and it crashed at the end of the train ride. Rebooted and managed to safely get to the end of the train ride without the CTD appearing. The got directions for the doctor down the road and it CTD'd on the way. Left the game and uninstalled it. Then I decided to pay for the reduced copy of the GOTY version at GOG as it showed a much more simplistic path to installation and gave me the vibes that it would run much more stable. Installed it and it worked fine I travelled all over most of South London both East and West with just one CTD. My cynical self said this was a ploy to get us to buy the discounted game for GOG. Remember GOG was the only one that could handle their 32GB download and they just happen to be a Game Store. A coincidence, my cynical self says. no. The London Fallout Team and GOG made this game easier and more stable to use on GOG's platform. If you want stability and ease of installation you will need to buy the GOG GOTY version of Fallout 4, very interesting that it is discounted now at this particular time to encourage just that action. Ill let you draw your own conclusions. By the way the game is great albeit a bit rough on FPS rate at times. I just don't like being conned. If the team and GOG were up front about it it would have made the sale go down a bit easier. And because of that I can only give it a 3 star rating on a game that should get a 5 star