No, MixCraft 6 is not compatible with Windows 10. You will need version 7 to have compatibility with Windows 10. According to the official statement, you can install latest Mixcraft on the following Windows versions: Windows XP, Windows Vista, Windows 7 (32 or 64 bit), Windows 8 (32 or 64 bit), or Windows 10 (32 or 64 bit).
To find more, browse to the official website: http://www.acoustica.com/mixcraft/