Title says it all, when I try the normal "save game" method the game always gives me the same warning that saves done with this version do not work in the previous versions but when I try to save after that nothing happens... And when I try to quicksave I cant even see that blinking letter anymore.
I'm playing on PC and already tried verify/repair option from GOG Galaxy without any results. Any help?

Problem solved, it wasnt actually the games fault but Windows 10. Had to run as administrator so the game can actually make the save files... (yeah I know, easy solution but sometimes the hardest to figure out...)