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Might depend on the OS version; in the past App Store had all the “big” updates and System Preferences only handled the minor ones. Now it handles all of them.

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On Catalina, you can find it in the App Store (https://apps.apple.com/us/app/macos-big-sur/id1526878132?mt=...) but when you click 'Get' it moves over to Software Update. I got the download started after a few tries but it is crawwwllling.

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