REINSTALL MOJAVE on iMac currently running Catalina My 2019 iMac27 Retina 250 SSD was shipped with Mojave v.10.12.4 and I really want to go back to that macOS and not use Catalina. Remember, this is a clean-install upgrade, it's not a reinstall or a recovery. In this case, I downloaded the Catalina installer from /en-gb/HT211683. Once upon a time, previous macOSs were downloadable from the Apps Store but now they appear to be on some separate Apple server. Sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume/Volumes/Untitled -applicationpath /Applications/Install\ macOS\ Catalina.app This is the full command line I've used in Terminal: Should I have left Install macOS Catalina open, then getting on with Terminal? Does that seem right? Also, when I downloaded the installer from HT211683, it of course opened, inviting me to Continue, but instead I quit the installer specifically using the Quit menu in the menu bar (because I'm wanting to do a clean install where I erase the Mac's internal SSD system volume). In the Applications folder, Install macOS Catalina is a 19.1MB file. Can someone here tell me what's going on? Also, Terminal tells me it can find no application called Install macOS Catalina.app, when in fact it's actually sitting in the Applications folder. Yet in Apple's support note HT201372 Apple make a point of saying that, with Sierra, that argument in the command line must be included. When I tested out Catalina via an ext drive made bootable a few weeks ago, everything worked fine and I was able to swap between Sierra and Catalina, but now that I want to actually make a permanent installation of Catalina, Terminal is objecting and telling me that I don't need to include in the command line the argument ". I've been trying to upgrade my 2013 iMac from Sierra to Catalina, doing a clean install from an external USB disk.
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