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I am running Catalina 10.15.7 on an iMac 2020. I have turned off the option "Automatically keep my Mac up to date" in the Preferences pane. I do not want to upgrade to Monterey. I want to manage all updates myself. However, four times until now the machine has downloaded the 12Gb "Install macOS Monterey.app" into /Applications without any notification. There was no indication this is happening. I just happened to find the "Monterey installer" in /Applications. Each time I have deleted the installer manually, but the OS keeps on downloading it again and again. Does anyone know how to stop the OS downloading the unwanted "Install macOS Monterey.app" automatically without any notice?

2 Answers 2

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Have you looked in Advanced… because it's possible for the main box to be unchecked, but components inside to remain checked. e.g.

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It should show a partial indicator, but it doesn't always

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  • 1
    Only "Check for updates" is turned ON. All other options are turned OFF.
    – MacUser12
    Jun 25, 2022 at 13:24
  • 1
    OK - I'd try the 'switch it off then on again' approach. Enable everything individually, reboot, disable it all again, reboot. See if it sticks.
    – Tetsujin
    Jun 25, 2022 at 13:26
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    No success. Today the OS started to download the Monterey installer again.
    – MacUser12
    Jul 2, 2022 at 20:30
  • Hmmm… not sure then. As far as I know that setting should be global, but is there another account on the Mac that could have set it differently? I'm out of ideas after that, sorry.
    – Tetsujin
    Jul 3, 2022 at 8:01
  • After turning off everything, even "Check for updates", a message appears saying: updates for this mac are managed externally. Any idea what exactly is behind this message and how to revers this?
    – MacUser12
    Jul 12, 2022 at 6:27
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Had the same problem and 2.10.2022 I did this and it still did not re-download 12GB.

Steps taken:

Permissions/chmod was:
drwxr-xr-x 3 root wheel 96 Sep 25 21:31 Install macOS Monterey.app

$ stat -f %A Install\ macOS\ Monterey.app
755
Deleting 12GB file
/Applications/Install macOS Monterey.app/Contents/SharedSupport]$ sudo rm SharedSupport.dmg

Password:
Creating fake file..
/Applications/Install macOS Monterey.app/Contents/SharedSupport]$ sudo touch SharedSupport.dmg

[ad@mbp /Applications/Install macOS Monterey.app/Contents/SharedSupport]$ ll

total 0

-rw-r--r-- 1 root wheel 0B Oct 2 17:53 SharedSupport.dmg

  

Nice and small..

$ du -sh Install\ macOS\ Monterey.app/

22M Install macOS Monterey.app/

Locking it for anybody

/Applications]$ sudo chflags uchg,schg Install\ macOS\ Monterey.app

I unchecked "Check for updates" then clicked ok. Checked it again just to be sure:

enter image description here

23 days later I still dont see 12GB file.. I won. 😁

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  • 1 December. Still winning. :)
    – A.D.
    Dec 1, 2022 at 17:46

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