Apparently it kinda needs an SSD HD, not a spinny-disc HD. There's a bunch of other things that will go wrong during the upgrade - for instance, you may want to clear your start menu by deleting the folder structure before it causes your new start menu to crash with several hundred shortcuts. It seems that as with all operating systems, clean install is the way to go.
There's a GWX control panel program that allows you to turn off the get windows 10 junk and delete the windows 10 install files and prevent windows from secretly downloading them again
that's convenient - way back when I had to search my windows update for that particular update and uninstall then hide it, hopefully it doesn't have another update that forces a win10 install on this system.
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