An after thought - judging from the Level you, Neil, and dialabrain have in this forum, I have to assume you both are pretty expert at the Mac. Would it be wise for me to try again upgrading to Catalina, even though most websites tell me that Mojave is highest I can go on a 2012 iMac? I bought a new Mac Mini (M1 chip) with Big Sur, so am trying to get this iMac prepared cleanly for my wife to replace her 2009 iMac (that runs El Capitan OS as the highest compatible). She doesn't need a lot of apps other than email, Pages, Numbers, browser, Zoom, Skype, etc. - the basic stuff. With that in mind, another question - is there a method for me to configure this iMac with her as the principal user without having to rewipe the drive again and start from scratch? She's not happy that HER iMac still says it's MY computer at times. I'm sort of off the main topic a bit so hope you don't mind my imposing a little more.