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Windows Central Question
I have an HP laptop that came with Windows 8 on it. I installed a legally questionable copy of Win7 on it. Can I upgrade it to 10 without a reinstall using the HP Windows serial number?
I would say you would have to go to your original Win 8 and choose to upgrade.
When you say 'legally questionable' is Win7 activated?
Have you tried manually initiating the Win10 update?
Windows 10 upgrade not showing up yet? Here's how to manually trigger an update | Windows Central[/url]
If you don't have a product key sticker on the bottom of your PC, then your Windows 8 key is stored in the BIOS via UEFI ( ).
The easiest way would be to reinstall Windows 8, which won't ask for your product key, it will automatically detect it in BIOS, then upgrade that to 10. It'll take a little while, but it's pretty simple, and it's legitimate.