This is turning into a detective story. I moved the other old-ish iMac to this desk and tried to upgrade using software update and app store. It didn't work. At All. Just won't do it.

Then I took another hour reviewing workarounds on various websites but again failed. Mac themselves do not provide software downloads old enough for this computer. I have since found out that it was manufactured in 2011 (but had to use a third party website to find THAT out!)

HOWEVER, I have found (on Amazon), bootable USB installations for most OSs. I think I'll go for Mavericks 10.9.5 attractively priced at £16.95+postage. To see if that means I can then upgrade Firefox which is at its limit until I do something about the OS; and fix those websites which don't work any more.

IF that doesn't work, it's only £20 or so wasted and a lot learned? What do you all think, please?

Last edited by Bensheim; 08/30/19 12:50 PM.