EverKey supports all 32-bit and 64-bit versions of Windows XP-SP2 thru Windows 10, including Pro and Enterprise Editions.
Also, Macs running Windows under VMware Fusion 3+ or Parallels 4+ are totally supported. We test programs protected by EverKey with all the current versions of Windows (XP thru 10) running on Macs using OS X up to and including El Capitan (OS X v10.11). We have been doing this since 2008 (Mac OS X Leopard v10.5).
Due to it's tiny market share (less than .5% as of July 2014), Windows RT (ARM Tablet) is not supported at this time.
EverKey Version 2 (Old Version) fully supports all 16-bit and 32-bit versions of Windows from Windows 95 thru Windows XP, including Windows Server Editions. Most brands of DOS Version 5 and later are also supported.