Quote:
Originally Posted by eschwartz
I believe you should be able to do an upgrade and then a clean re-install.
The upgrade registers your product key *for Win10*, after that the clean install communicates the key baked into the BIOS and MS knows you are allowed to have Win10. 
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The clean reinstall can also be done by doing a reset set to not keep anything. It should be a quick process. These extra steps may not be necessary, but Microsoft has not specifically stated you can do a clean install as an upgrade so doing the upgrade first is just to be safe. Hopefully they will address this question soon.