I'm not sure where to post this, since it's not a bug, but getting the GoG version to work is easy, just execute the game from the fallout.exe in the main folder. Don't use the shortcuts GoG provides.
*Dies*
Speaking as someone who has been resisting the temptation to play since RP 1.0 was first released, I'm not really quite sure what to say... This is an amazing effort! Congrats Killap, you just made the best game in the world even better!