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Ok so I managed to open it somehow

but the save option doesn't work properly
I am able to get into the save menu and choose a file but it doesn't save when I validate the file
did you have that issue before?

Hee, I just bought the game and downloaded the mac version. When I unzip the file and try to start the game it says mac cannot open it because the developer cannot be verifyed. 
Any help on that?

p.s.: I am also from germany, I think a steam key would also work for me