I upgraded to Windows 10 Pro N from Windows 8.1 Pro N.

Previously in Windows 8.1 Pro N, the game could not run as WMVcore.DLL was missing, this is a component missing from N version of Windows which is resolved by installing Media Player package. However this package does not exist in Windows 10 yet and the older installers for older versions of Windows is incompatible, so you're forced to google up for missing DLL files and place into the game folder.

The game runs smoothly - until it crashes, I don't know what's happening, the game doesn't actually crash, but the video does not update anymore and stays still as if it's crashed. The sound playback still works flawlessly, I can hear the music playing in background, my mouse cursor moving over menus and other players casting spells.

Word of advice for those running Windows 7/8/8.1 N to NOT upgrade.