Got a Windows 10 Pro key for a rig I upgraded from a Windows 7 Ultimate license, then replatformed the motherboard, triggering Microsoft's warning. Key worked great first time!

Gekauft, 10 sec warten und fertig 5/5

So easy, pay then copy & paste to Activation. Thanks so much!

worked great..just by entering code to "change product key" field..

Working well, perfettamente funzionante