Maybe still a problem with Gem being 32-bit?......... but more likely a graphics card problem. Gem and many other video programs, and most PC Games rely on OpenGL. You might find out more by trawling the "Gamers" sites for OpenGL errors + win10 + your graphics card.
Microsoft pushed hard to move everyone to directX11. As I understand it the graphics chip manufacturers went along at first, but the backlash was furious and they were forced to re-write their drivers for OpenGL. You might just need a different driver. If so, the next problem would be keeping it... avoiding automatic updates.
AHHH! sorry...... just spotted that you tried 0.94-test3. Yes, that works for win7 as well, but not everything is there. You will need some other dependencies probably.... maybe msvcr110.dll or others? may-be.zip . Also it didn't work for me (at all) until I dumped the contents of the QT folder into the main 0.94-test3 folder. Also not all Gem objects are present. I started, but I didn't finish.....it is on-going.
You might need "quicktime" as well for some things to work. Is it available for win10?