I had a copy of the Mojave installer available, but when I booted using the MacBook Air in Target Disk Mode, it was running Catalina, and wouldn’t let me install Mojave because it was too old.
The whole Apple "We won't let you install old OS's" and "Good luck finding an old OS install image. Ha! Ha!" infuriates me.
I don't want to have to go trawling through Warez sites just to find a version of OS X compatible with a 5 year old computer.
You don’t need to go to water sites. The installers are in the App Store just hidden. I have a link somewhere to the Apple support KB with the AppStore links to their previous OSes. But they really want you to run the latest OS and make it abundantly clear they don’t want you to even think about old hardware.
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The whole Apple "We won't let you install old OS's" and "Good luck finding an old OS install image. Ha! Ha!" infuriates me.
I don't want to have to go trawling through Warez sites just to find a version of OS X compatible with a 5 year old computer.
Apple has working installers for 10.10 and up linked here:
https://support.apple.com/en-us/HT208052
It's kind of annoying that the OS X Mountain Lion update that I paid for is no longer available from the App Store…
From the App Store app on a 10.13 machine, all of the 10.7-10.11 updates show up in Purchased for me
You have the old App Store. The new one doesn't show it…
You don’t need to go to water sites. The installers are in the App Store just hidden. I have a link somewhere to the Apple support KB with the AppStore links to their previous OSes. But they really want you to run the latest OS and make it abundantly clear they don’t want you to even think about old hardware.