I have the same problem. I'm using Windows 10 (64bit). I have used the updater and everything is up to date. I can load a new mission from the start (only tried training and Tears of St Lucia so far) and save it without any apparent problem. When I try to load a saved game it I get the splash screen but after 2-3 seconds "Game Error. Couldn't load Thief DarkMod 2\Maps\SaintLucia.script" I have checked file permissions and given full access. I have removed 'read only' attributes from all files. The saved games directory is there with 3 files for each save (name.save; name.tga; name.txt) Directory tree is: Games\Thief\Thief DarkMod 2\Thief DarkMod 2\fms\saintlucia\savegames There is no directory called 'maps' anywhere and I can't find any files ending .script