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My computer came pre-installed with Windows 8 Home, the licence key being baked into the BIOS. I have since upgraded via the Microsoft-offered free channels to Windows 8.1 Home, and now Windows 10 Home.

As Windows 10 still accepts Windows 7, 8 and 8.1 keys, I have recently purchased a Windows 8 Pro Pack to upgrade my Windows 10 installation from Home to Pro (though even if it doesn't work, I'll reinstall Windows 8 and work my way up again).

My question is, since my Home key has an OEM origin, yet my Home-to-Pro-upgrade-only key is retail, if I want to sell my laptop in future, would I be able to revert to the OEM Home licence and take the Pro-upgrade key with me to a new computer?

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    You "My question is, since my Home key has an OEM origin, yet my Home-to-Pro-upgrade-only key is retail, if I want to sell my laptop in future, would I be able to revert to the OEM Home licence and take the Pro-upgrade key with me to a new computer?" - Technically speaking your not even eligible for the upgrade, so technically speaking if you ignore that fact, your Professional license has transfer rights – Ramhound Feb 1 '17 at 2:46
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Microsoft will tell you that your Windows 10 Pro upgrade is a digital license. As a result, if you ever need to Reset or Refresh your PC after the upgrade, it will install Windows 10 Pro:

Activation

But your upgrade is only good on one PC:

The upgrade will be licensed only to a single PC. So, if you purchased a retail Windows 10 Home license and you purchase a Windows 10 Pro upgrade, that upgrade will only work on a single computer. While you’re entitled to move the original Windows 10 Home license to another computer, that Windows 10 Pro upgrade won’t follow you to another PC.

(Source: How to Upgrade From Windows 10 Home to Windows 10 Professional)

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  • Thank you for your answer. The one you highlighted doesn't apply in my case, as my upgrade will have been from a retail box containing a Product Key Card. My situation is exactly the opposite of the How-To Geek article: my Home licence is non-retail and my Pro licence is retail. – user338381 Feb 1 '17 at 1:51

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