I have the steam version and GOG version. Both are not supported out of the box. I was under the impression the GOG version was updated more than the Steam version based on Forum posted. It's not. It runs at 5 fps and is unplayable. I wish it worked out with the GOG version since I was eager enough to buy versions of the game in order to have a smoother process. The Steam version does work with lots when you mess around with the files a lot and bring up files from various updates and online sources. Anyways, it's quite frustrating. Sorry GOG.
