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I have a M1 dual boot configuration with two installations of MacOS in separate APFS volumes. I recently updated one of them to Monterey. When I boot into the other system running Mojave, it also prompts for an update but tries to download the whole 12something GB update package again. Is it possible to use the update file from the other installation on this one?

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  • If you still have the Monterey installer in one volume, just mount all volumes and copy it. But most probably the installer is gone after a successful upgrade.
    – lhf
    Apr 11, 2022 at 11:50
  • Do you know where the installer would be located when downloaded by software-update?
    – cachius
    Apr 11, 2022 at 11:52
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    ↑ /Applications/Install macOS [name] but it will self-delete after a successful update. I never looked to see if it went to Trash but I'd suspect not. Next update, copy it over first.
    – Tetsujin
    Apr 11, 2022 at 12:12

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After download the installer is located at /Applications/Install macOS Monterey.app. A copy onto the same filesystem can take advantage of APFS's clone feature and should suffice if mounted from the other installation.

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