Re: After >20 years
I started here: http://www.ghacks.net/2015/04/17/how-to-remove-windows-10-upgrade-updates-in-windows-7-and-8/
and then did these Registry hacks: http://answers.microsoft.com/en-us/windows/forum/windows_7-update/how-to-cancel-windows-10-upgrade-for-now/71a30488-8171-48fe-9a4d-728b4081bfd3?auth=1
I haven't tried the Registry hacks mentioned above because so far, Windows Update is behaving as it should. Good luck!