I've got a retail boxed copy of Windows 7 Professional that I bought many years ago and is no longer used on any computer that I own (I've moved to a Mac in recent years). If I build a new PC, can I put Windows 10 Pro onto it doing this:
1. Install my Retail copy of Windows 7 Pro on the newly-built PC and activate it;
2. Upgrade that Windows 7 Pro to Windows 10 on the new PC;
3. Get the Windows 10 ISO image;
4. Clean-boot the ISO from a USB key/DVD to do a fresh install of Windows 10 on the new PC.
Essentially I want to end up with Windows 10 Pro on a newly-built PC. I just want to check that the above is technically and legally possible.