It's just not a thing that enough people need to do often enough to be worth the software engineering work.īeware that for built-in apps like Photos and Mail that store their data in proprietary, undocumented database-like formats, you might have problems downgrading. The problem you're facing is that things like how settings are stored, how user account information is stored, how your Photos.app and Mail.app data is stored, how your Spotlight search metadata is stored, etc., often change from one major OS release to the next.Īpple writes the code in the new OS version to upgrade those settings and data to the new formats as applicable, but it's not cost-effective for anyone to write code for the old OS version to know how to downgrade settings that have already been migrated to the new version. For example, apps sold outside of the App Store often come with installers that install a bunch of stuff in various places under /Library, and it would be hard to find all those files to restore them to your High Sierra environment.įor system settings, just set up all your settings again by hand. You can use the Time Machine UI (in the Finder) to restore your users' home directories.įor most apps, you'd be better off re-installing them from their installers, especially if they might not be self-contained. It's no surprise that Migration Assistant won't help you with this.
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