Windows 10 Install to Another Computer

[DuelShott]

So I have a test bench with no os. I wanted to use the Windows Key on my laptop and just deactivate Windows on the laptop. But There is no product key because i upgraded. Anything I can do other than backup my laptop HDD to the test bench SSD?

[Oshino Shinobu]

Valid Windows 7 and 8.1 keys should work for Windows 10. You may have issues with OEM keys, though. If the laptop's not being used, then it's worth a try. If not, you should be able to reactivate the laptop. 

[DuelShott]

@Oshino Shinobu There is no product key in the settings.

[DuelShott]

@Oshino Shinobu should i downgrade?