We have added an experimental support for windows 8 and 10. But the player must change a few settings themselves.

The KhanClient.exe has to be set to run on Windows 7 Compatibility mode and must be "run as admin" in order to work. (see screenshot below)

Known Issues:

• Slow Loading.
  
• Steam Overlay doesn't work.
  

This will be updated as soon as we find a better way of dealing with the issue. As of now the options mentioned above it the only way to play on Win 8 and later.