Plus, have you even tried my proposed, possible solution? Maybe that's all you need to do. Back up Windows 10 on whichever side it's activated, wipe the partition, reinstall Windows 7/8x, reboot into the other side (if Win10 was activated natively, boot to the VM. If Win10 was activated in the VM, boot natively), activate Windows 7/8x, perform all updates, then run the Windows 10 upgrade. If that works, restore your backed up Win10 install. Try it. It may work and get around this issue. It is a *REAL* pain in the keester, but if it works, it only has to be done once. If it doesn't, that's just more proof that Microsoft really screwed this up bad here.