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Mac OS X Catalina will be released in a few days, so how can I block updates to that OS so it doesn't get downloaded and, ideally, I don't even get prompts to upgrade.

I have 32-bit software I intend to keep on using, so I can't update since this version of OS X will support 64-bit apps only.

  • I've never known Apple to force a full version upgrade. They tend to keep pushing reminders at you. I won't be able to test for Catalina as I have no machine that is compatible. – Tetsujin Sep 1 at 8:15
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System Preferences -> Software updates -> Advanced. You will see options to toggle download and update choices.

It's hard to delay notifications more than a day.

  • If you untick 'Check for Updates' then it also unticks 'Install System Data Files and security updates'. Does this mean there's no way to opt out of OS update reminders, but still get security updates? – Marcus Sep 21 at 12:40
  • As far as I know, you can still download and install security updates by manually checking in the "Updates" tab of the App Store app. BTW, in High Sierra there isn't any "Software updates" icon in the System Preferences window. The icon to use there is the one called just "App Store". – OMA Oct 3 at 8:30
  • @Marcus one could regularly check the security webpage of Apple, sign up for newsletters if any. – ankii Oct 3 at 9:46
  • @OMA Mojave sends all updates via system preferences I think.. Not App Store – ankii Oct 3 at 9:46

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