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The availability of security updates for older MacOS releases is particularly useful to know if a Mac is ignoring MacOS Catalina software update for compatibility or any other reasons. Recall that MacOS Catalina 10.15.3 updates are only available on a Mac that is already actively running MacOS Catalina.įor Macs running prior system software versions like macOS Mojave 10.14.6 or MacOS High Sierra 10.13.6, there will be Security Updates and Safari updates available to download instead through the system Software Update section of MacOS. MacOS Catalina system software updates require a notable amount of free storage space available, and the computer must reboot to complete installation.

Choose to update to macOS 10.15.3 Catalina when it is shown as available for install.Select the “Software Update” preference panel.Go to the Apple  menu and choose “System Preferences”.How to Download & Install MacOS Catalina 10.15.3 Updateīe sure to backup the Mac with Time Machine before installing any system software update.

Separately, Mac users running Mojave or High Sierra will find new Security Updates available for those respective operating systems.Īdditionally, iOS 13.3.1 and iPadOS 13.3.1 were released as updates, along with watchOS 6.1.2 for Apple Watch, and tvOS 13.3.1 for Apple TV.