Restart Windows 10 following hardware modifications
Restart Windows 10 following hardware modifications
Others mentioned that the free upgrade depended on your earlier machine, essentially its motherboard. A new PC means no longer a valid license. Still, the upgrade remains functional. Most users have extra licenses lying around that can unlock your existing Windows 10. If not, many forums (possibly this one) list sellers offering genuine keys for around ten dollars.
Sometimes OEM licenses linked to MS accounts function correctly in new builds as well.