![]() Activation will be automatic upon completion of installation. This method does NOT require any product key. Go to the ISO file you have created by Media Creation Tool, RIGHT click at it > click Mount > click Setup.exe. Start button > Settings > Update and Security > left side, select Recovery > right side, select Go back to Windows 8.Īfter you are back to win 8.1, do an in-place install. Initial upgrade is supposed to be done either via Windows Update or via "in-place" upgrade install with the ISO.Īfter initial upgrade is completed and activated which is automatic, then one can use the ISO file > burn it to a bootable media > then use the media to do a clean install. ![]() The new install will NOT get activated without the proper Win 10 RTM product key. It requires a Windows 10 product key, not your Win 8.1 key. In this case, you did a clean install of Windows 10. ![]() How do I get my Key working again or how do I get a new key from Microsoft which works?Ĭlean Install requires a product key of the OS one wants to install. My product key is vaild, I bought a OEM-DVD from "" and Microsoft said Windows 7/8(.1) users are allowed to get a free upgrade. There's no way for me to go back to Windows 8.1 without deleting all my data. I entered my product key some time ago but now it says the key doesn't work and gives me this error "0xc004f050" ![]() I created a Windows 10 USB-Stick using the MediaCreationTool, overwrote the Windows 8.1 Partition and did a clean install of Windows 10.
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