Why can’t I update my Mac OS?

If you can’t get your Mac to update properly, the first thing to do is try to run the update in Safe Mode. The easiest way to boot into Safe Mode on a Mac is to hold down the shift key while it restarts. So if your computer is off, press the Start button, and if it’s on, start the reboot sequence.

Is my Mac too old to update?

Apple said that would run happily on a late 2009 or later MacBook or iMac, or a 2010 or later MacBook Air, MacBook Pro, Mac mini or Mac Pro. This means that if your Mac is older than 2012 it won’t officially be able to run Catalina or Mojave.

What is the latest version of Mac OS?

Releases
Version Codename Processor support
macOS 10.14 Mojave 64-bit Intel
macOS 10.15 Catalina
macOS 11 Big Sur 64-bit Intel and ARM
Legend: Old version Older version, still maintained Latest version

How do I update my Mac when it says no update?

Go to System Preferences and select the app store, turn on Automatically check for updates and checkmark ON all the options.