Hi BorisZv, We're not on GoG, the game was rejected by their curators because it was too niche!
Thanks for the bug report. If you move it to an Ext4 partition it will most likely work. There does seem to be a problem with 64 bit filesystems. It's on the list of things to fix.
Oh and all copies are DRM free, on all platforms.
(PS: I deleted your other post, hope you don't mind)