I am trying to run the upgrade from my Windows 8.1 Pro computer to Windows 10. It keeps telling me:
Setup has failed to validate the product key
This has happened when clicking "Upgrade" inside the Windows 10 Media Creation Tool and has also happened when running the installer from a flash drive. However, that flash drive did successfully install Windows 10 on another computer.
How can I fix this?
This computer is a Lenovo ThinkPad T530 which originally shipped with Windows 8 (basic), was upgraded to Windows 8 Pro, and then to Windows 8.1 Pro. When I run NirSoft's product key retrieval tool, it shows the original Windows 8 key stored by Lenovo in the BIOS as well as the Windows 8 Pro Upgrade key. Could it be that the upgrader has "decided" that these keys are not eligible for upgrade?