I don't have 10 installed, but doesn't my installer work for GK3? The GOG version is based on my installer. I would appreciate any input about Win10 compatibility issues.
Collector, yes your installer worked to run GK3 with Win10 using the original CD disc set. For reasons beyond my knowledge GOG states for GK3:
Works on: Windows (XP, Vista, 7)
I don't know if this is just an oversight in not listing Win8 and 10 or that the game tended to be problematic for other reasons with those operating systems. Currently I don't have the GOG version in my possession so unfortunately I can't say for sure at this point.