Does anybody know how to Downgrade Windows 10 Pro to Home Edition? My BIOS is UEFI and the product key still displays a Windows 8.1 Home edition key. My current OS is Windows 10 Pro KMS. I'm on Win 10 build 10586 Pro. I heard with this build you can upgrade the Windows 7/8.1 to a Windows 10 key. So i'm trying to make this laptop a Windows 10 Home with legal key because I want the BIOS key to be the same as product in the registry.