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MacOS Sierra 10.12.5, Security Update 2017-002 El Capitan, and Security Update 2017-002 Yosemite. MacOS Sierra 10.12.4, OS X El Capitan 10.11.6, and OS X Yosemite 10.10.5. IPhone 5 and later, iPad 4th generation and later, and iPod touch 6th generation. Apple Music 2.0 for Android. Android version 4.3. Mac OS Mac OS Download Problems. What to do if the Mac OS High Sierra Download don’t download. During the download process, the massage “macOS High Sierra download has failed”. There are many problems that generates this message. If too many people try to download the software, you must wait and try to download later.

Is your Mac up to date with the latest version of the Mac operating system? Is it using the version required by some product that you want to use with your Mac? Which versions are earlier (older) or later (newer, more recent)? To find out, learn which version is installed now.

If your macOS isn't up to date, you may be able to update to a later version.

Mac Os High Sierra Security Update Stuck

Mac Os Sierra Security Update

Which macOS version is installed?

From the Apple menu  in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it.

Which macOS version is the latest?

These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Big Sur. As updates that change the macOS version number become available, this article is updated to show the latest version of that macOS.

If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos.