Microsoft Community Forum has released a free upgrade key, help users upgrade to Windows 10 Professional Edition.
I don't know why there are bad reviews for this office 2016 product key. Perhaps they expected digital download. https://t.co/W9khNCFUV1
— Windows 10 Keys (@key1024) April 27, 2016
Windows 10 Professional Product Key Usage is:
1. “set” (Settings)-> “upgrade and security” (Update and Security)-> “activate” (Activation)-> “change product key” (Change Product Key)
Or directly in the Cortana enter “Change Windows 10 Pro Product Key”
2. the Windows 10 Pro Product Key is: VK7JG-NPHTM-C97JM-9MPGT-3V66T
Your system will automatically start after upgrade to Windows 10 Pro (Professional Edition). Microsoft says that this applies only to the Windows Build 10586 10 Home Edition user.
Even more crucial is that upgrading is free, but, after entering the desktop that is needed to activate the professional version, buying into the “set” (Settings) “activate” (Activation) page, and then click the “store” (Go to Store).
Windows 10 Pro upgrade $ 199, $ 80 more expensive than Windows 10 Home.