I had to roll back my OS X version, and ended up with High Sierra (factory install, then some security updates). But when I imported my settings from Time Machine, I managed to end up with numerous programs that require a later OS X version, and will not open. These include Notes, ctivity Monitor, Terminal, and various dyn libraries needed by other programs. How can I bring apps and libraries back to the OS version I have (i.e., High Sierra)? I do not have a usable backup of the apps folder for this version. Is there an alternative to doing another full instal of High Sierra?

I plan to upgrade to Catalina next, but the catalina installer is among the apps that run but fail, with a complaint about incomptible versions.

  • Basically you can'\t you need the versions of the apps that run on the older OS. In this case it might be better to sort out the issue that made you roll back - why did you have to do that – mmmmmm Feb 15 at 10:11
  • Reason: Essential third-party app that does not run on Big Sur. My goal here is exactly to restore the versions of the apps that run on the older OS -- sorry if that was unclear. Is there a way to do that without reinstalling the entire OS again? – alexis Feb 15 at 10:24
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    Don‘t restore applications from backup then but reinstall them from the App Store. – nohillside Feb 15 at 10:56
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    @nohillside, sounds great but how does one install standard system applications from the App Store? I just searched for Textedit, Activity Monitor, Terminal ... I don't see any of the standard apps on offer. – alexis Feb 15 at 11:44
  • Not at all, they get installed with the OS – nohillside Feb 15 at 12:09

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