PP Mguire
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Oddly wasn't the case for me. When experimenting at work with the upgrade and install procedure Windows 10 upgrade took the pirated version and upgraded it to 10 Pro, but my Retail 8.1 Pro key it kept saying was invalid when it's a legit key I can use to install and activate 8.1 every single time.The Win10 Upgrade are supposed to carry over the license rights of the previous OS (i.e. upgrading from Win7/8 OEM will result in an OEM WIn10, but upgrading from Win7/8 Retail will give you a Retail Win10). There's been some issues with that already and some clarity is needed on if that's indeed the case - but according to the license agreement for Win10, that's how it's supposed to work.
So if you have an OEM copy and swap out your motherboard...then yes you need to buy a new copy of Win10. If you have retail however, it should be fine as retail allows transfer to another system as long as it's installed only on 1 single system at a time.
Yes, your activation will still work at any time now because you already went through with the upgrade.
It did that for me as well even on a clean install - was thinking it downloaded and applied an additional update or something and those settings didn't get saved right away. Not exactly sure, but didn't result in any issues.
Also, I found it weird that when I permanently disable Defender via a reg entry it knocked my copy of 10 Pro down to 10 Home Single Language.