![]() ![]() I have created a bootable installer from it to a USB disk. ![]() I have downloaded macOS Catalina and have 'Instal macOS Catalina' in the app folder. There is another partition which has been erased and is ready for Catalina. I have another SSD attached which is APFS formatted and has a number of partitions, one with Monterey on it and one with Big Sur. ![]() It is currently booting from an external SSD into Monterey because the internal HDD is so abysmally slow. Then create the bootable installer using the Mac Pro.ĭowngrade macOS from Monterey to Catalina on 2014 Mac Mini with external disk I need to run Catalina on my Late 2014 Mac Mini, which originally came with a much older macOS. It might be worth waiting until you get the machine and see if you can take advantage of that option before subjecting yourself to more aggravation on the path you're currently walking.Īnother option is that if the Mac Pro boots into Big Sur when you get it, you can use it to download the Catalina installer from the App Store using the link I included previously. I believe this would be macOS Catalina if the Mac Pro did in fact originally ship with that OS. Otherwise you're offered the macOS that came with your Mac, or the closest version still available." If you use Option-Command-R during startup, in most cases you're offered the latest macOS that is compatible with your Mac. "On an Intel-based Mac: If you use Shift-Option-Command-R during startup, you're offered the macOS that came with your Mac, or the closest version still available.You might have a look at this Apple Support document - How to reinstall macOS: I do know that Firefox has been reported to have problems and I'm not sure about Chrome. Make sure you're using Safari when you try to download the installer. The correct installer is 4.9GB in size and will install 10.15.7. But I'm not quite understanding why you're having such a time with the download. No, your MacBook Pro with High Sierra isn't too old to recognize the Catalina installer. ![]()
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