New
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8.1, upgrade to Windows 10, then clean install. Success.
Windows 8.1 Activated with Genuine Product Key (I've used Genuine Product Keys since Windows 3.00a). I upgraded to 8.1 Pro with another Genuine Product Key.
I tried to upgrade to 10 Pro without installing updates on 8.1 Pro (over 100 updates) but no luck. I had to install all the updates.
I used the MediaCreationToolx64 to try to upgrade to 10 and got a "Something Happened" error. I then used a DVD from within Windows 8.1 Pro to upgrade. This activated.
Cleaned my SSD with DISKPART. Clean installed 10 Pro from the DVD and this Activated. I then set Updates to Fast Builds.
Success.