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I've just tried to install Adobe Bridge on my wife's Air, and got the message that I need a newer macOS for it. Having checked the OS version, I noticed it hasn't been updated since 10.13.6, which is a year old now.

App Store Updates only shows several Apple apps and that are incompatible, presumably because they are all version 11+.

Why doesn't the newer MacOS show up on this computer?

About this Mac Software Update

texnic
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  • It would have nagged for the first year - Mojave was released in 2018 - but would have given up after that. I'm not sure it would be wise to jump all that way in one go, & I certainly wouldn't start without a known-good backup. I think perhaps Catalina would be the 'stepping stone' to use, though some firmware updates were set at Mojave to pave the way. See https://apple.stackexchange.com/a/309400/85275 for some background & links. Apple did away with the old style App Store at Mojave & OS updates are no longer in that app, they have their own preference pane instead. – Tetsujin Jan 08 '22 at 07:15
  • @Tetsujin According to https://support.apple.com/en-us/HT211683, Big Sur can update High Sierra and even older versions. Is there any reliable information on why not to make a big jump? I checked the linked answer, and it seems to be partly outdated but importantly doesn't really provide any reliable links, just mentions "received wisdom", which seems to contradict the official information. – texnic Jan 08 '22 at 15:29
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    Apple may have changed the installers over the years. "Received wisdom" springs from the number of reports on this site over the years of people trying & failing to do large OS jumps in one go. Note the answer was first written in 2017 & has been in a state of flux ever since. If you have solid backups, feel free to experiment. – Tetsujin Jan 08 '22 at 15:34

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