MacOS Mojave or Later follow this set of instructions : Or click More info to see details about each update and select specific updates to install. If any updates are available, click the Update Now button to install them., then click Software Update to check for updates. Choose System Preferences from the Apple menu.Then follow the instructions for the version of the MacOS you have. How to Update the OS software on your Mac, Mojave or laterįor all MacOS upgrades follow steps 1 and 2 below.