I have a recollection of the game having so much issues in the Linux version that the devs couldn't or didn't want to fix, they pretty much dropped support for it entirely. That could explain why it was never brought to GOG.
There's some sad reading on their support forum, if it still exists..
Game works on wine tho, at least the first one. I've played through it entirely.
Post edited June 11, 2017 by clarry