Well, I'm supposed to be tech-savvy, have been an enthusiast in one way or another since 1982.
I should've anticipated the possibilities based on that experience, but I didn't. Last year, I was trying to decide what to do. I can't just leave my perfectionist Win 7 installations in the ditch.
I actually came to the conclusion "Oh, what the hell! If I need Win 10 for a new machine, I'll buy it and try it then."
M$ was promoting their free upgrade as an "upgrade" that would be easy for mainstreamers to suffer without pain or misgiving. Again -- I should've visited the download site and done some poking around a reading, but I didn't.
But the simple solution coincides with a time when nobody should have an SSD or HDD boot drive 75% occupied with their OS, software and files. If they do, some rearrangement might be in order.
But if I'm moving to a new OS, I want to guarantee that all my software works with it, and I damn don't want to overlay 10 on 7 and find out there are glitches. I'd rather do a clean install.
We've prepared all our systems as dual-boot Win7/Win10 with 10 activated. I couldn't imagine that somehow, after July 29, I would have a problem with either OS on these systems.