Quote Originally Posted by ss-kalm View Post
I don't believe that is still the case.
You can't 'upgrade' to 10 for free anymore, but if you do a fresh install you can use the Win 7 serial if it's a retail number (no Dell/HP/Asus on the COA sticker).

I boot from a Win 10 USB, delete all partitions, choose 'Custom Install, enter the Win 7 serial and let it rip.