![]() ![]() Long story short, be prepared to be unable to install Big Sur and being forced to install Monterey. That makes it sound like it took 10 minutes, but it took more like an hour. Then tried to install Catalina, and it went right in. ![]() After getting back from the emergency room being treated for blood loss from banging my head against a brick wall, and being an obstinate you know what, I tried twice more. Tried a few more times on the iMAC at various times of day, etc., making sure I had trashed any previously downloaded files, emptying the trash, and then shutting down and starting. Tried downloading to a Windows computer and to a Linux computer. Tried downloading it to another MAC and transferring it to the iMAC with a flash drive. I thought maybe I just had a corrupt download so I trashed it and tried again. ![]() dmg file downloaded but wouldn’t install. Tried Safari and the link came alive but again, IIRC, the Mojave. I tried to do that from Firefox and the link was totally dead. I found an Apple web site that claimed I could download Mojave and then install it. Ha! The icon was basically non functional I don’t remember whether it was basically a dead link or whether I got some kind of error message, but in any case it was worthless. In Launchpad I had the “Install Mojave” icon so I thought I’d be all set to do what I wanted. I had intended to upgrade to Mojave (the next step up just as Big Sur is the next step up from Catalina). This doesn’t really answer your question about safety, but I was in an analogous situation with an iMAC running High Sierra. ![]()
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