Add license key check for authenticity of Windows versions

Utilize Microsoft resources here: https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/dn502532(v=ws.11)

Note that this says Windows server, but I am sure it should work similarly for Windows Home and Pro editions. Actually reconfirm if this is the case.