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. I did boot to one of my other disks which is running macOS Big Sur, but trying to run 'Install macOS Catalina' says 'This copy of the macOS Catalina installer application is too old to be opened on this version of macOS.' ", and this is where I managed to download Catalina. you might be able to upgrade to an earlier macOS, such as macOS Big Sur, Catalina. I tried going to How to get old versions of macOS - Apple Support 'How to get old versions of macOS' where the first paragraph says ". Trying to run the 'Install macOS Catalina' from the App folder fails as well. I have tried Cmd-Shift-Option-R but the second option isn't 'Reinstall macOS' which might get back to the original OS that was there in 2014, its always 'Reinstall macOS Monterey'. When I press Option during restart, the bootable installer never appears as an option, just 3 of the other disks attached. 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. Im also gonna try to turn the security settings of the T2 chip back to default afterwards.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. I think it might work by downloading Catalina from the internet in recovery mode, but my connection is slow so the USB drive I made seems to work The T2 chip setting with the admin password and reformatting the disk preinstalled with Big Sur seem to be the only thing different from past downgrades I’ve done for music software compatibility. I have described these steps to the best of my memory. It will restart into the recovery screen but this time it will have Catalina as the second option instead of Big Sur. I had to do this before it would ever allow Catalina to work. Enter disk utility and erase the Macintosh HD system drive. Restart again with cmd-r and go to disk utility. Under that change to allow boot from anywhere. Change the security settings to no security which is the third option. Restart and press cmd-r and go to the startup security tab under “windows” at the top. Create an admin password and connect to your Apple ID. Open the new 2019 Mac Pro and boot up into Big Sur.
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