New
#11
How clean was the install?
If you launched the upgrade from within Windows 7, I believe that counts as an upgrade, even if you choose to keep nothing from the Windows 7 installation.
If you created a bootable installation medium (DVD, USB thumb drive), started the PC from that, and did a really clean install, I believe that will not activate unless you previously had Windows 10 installed as an update.
My guess as to what MS support would say in the latter case would be to restore Windows 7 and upgrade to 10 in the approved manner. I'm curious as to what their advice would be if told that you hadn't kept any means of doing that. Maybe they'd help if they could be convinced it was an honest error. (In my rare dealings with them in the past, they have been accommodating. I feel that activation exists to prevent large scale casual piracy, not to try to pry a few more dollars out of individuals.)