The upgrade aligns (for lack of a better word) your existing Windows 7/8 license key for use with Windows 10 (for the free offer). You have to perform the 'upgrade' first in order to later perform a 'clean' install of Windows 10. If I format with the Win 10 USB from the media creation tool, where/what serialĭo I put in, do I put my Windows 7 key? I'm not sure how the key works as I've not actually installed Windows 10, and my friend's install verified his Win 7 and upgraded. But I would rather do a full format rather than do an upgrade, just because. So, I can download Win 10 from the site, and it verifies my Win 7.
