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Use Win8 key from laptop bios to install Windows 10 on desktop

How could I use the Windows 8 CD key in my HP pavilion 11 x360 to install and activate Windows 10 home on my desktop?

My fiancees desktop needed to be reinstalled so I downloaded the Win10 iso from Microsoft and made an install USB.
Since the install promoted me for a product key I just ran ProduKey on an old HP laptop with shipped with Windows 8 and I since before had upgraded to Windows 10.
I wrote down the key for Windows 8 stored in the bios and used it during the install.
It got both accepted and activated.

How was this possible?
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  1. Best answer
    what key had been used on her desktop before? If it had Win 10 on it already, all you should have done is click "I don't have a key" and win 10 would have continued install and reactivated itself. Activation info about win 10 computers is stored on Microsoft servers, it would have confirmed that machine had a win 10 key already.

    Its possible the key you entered was just ignored once PC got the desktop.
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