Actually, they say that their number one support question is “How do I upgrade to Windows 10?”
LOL, of COURSE it is. (What else would they say it is?) C'mon, you forgot your /sarc tag. :-)
Actually, it might be true -- a lot of people have had trouble with the upgrade, especially from Win 8.1
I've upgraded a couple Win 7 to Win 10 with no problems, but the only 8.1 to 10 upgrade I tried failed miserably and I had to reload 8.1 fresh.
Well, they would say that, wouldn't they, given their whole attitude about W10 "upgrades"? You didn't actually expect them to admit it really was "Who the hell told you motherless crotch sniffers you were allowed to shove your latest product down my throat?", did you?