older mac os
i have an iMac 21.5 inch, late 2013, running Mac OS Sierra 10.12.6
i cannot upgrade to Sierra...which update should I install?
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The Late 2013 iMac can be upgraded to macOS High Sierra, Mojave or Catalina.
see > https://support.apple.com/en-us/HT211683
Going straight from Sierra to Catalina would be a considerable shock to both you and the iMac.
Personally I would backup and go for High Sierra, then move unto Mojave or the more challenging Catalina....
To get High Sierra open Safari and click on > https://apps.apple.com/us/app/macos-high-sierra/id1246284741?ls=1&mt=12