With the aforementioned apps, you can even schedule the creation of a bootable backup every night, so that youll always have a fallback regardless of what goes wrong.For example, once youre running macOS Mojave, you wont see the macOS High Sierra page listed in the Mac App Store, nor will it show up in App Store search results.
Link High Sierra Outside Of The App Store Upgrade To TheThe idea is that once you upgrade to the latest version of macOS theres no going back to using an earlier version.While Apple would justify this limitation in the name of simplifying things for consumers, the fact remains that many users may still need to download an older version of macOS at some point.
Reasons for doing so may include downloading an installer for another Mac that has limited or no Internet access, troubleshooting another Mac that wont boot, or even creating a bootable installer for the purpose of downgrading your own Mac if you find that software you rely on has incompatibilities with the latest version of macOS. We here at TechJunkie even discussed the issue in an article about the problems with frequent updates need for Apple to tap the brakes: Apples Frequent Update Experiment Has Failed Its Time for Another Snow Leopard. Thankfully, theres still a way to download High Sierra on a Mac running Mojave, even if Apple doesnt make the process clear. ![]() Note: These initial instructions are not to downgrade from Mojave to High Sierra but to download High Sierra to use on another Mac. Link High Sierra Outside Of The App Store How To Downgrade MacOSThe second part of this article describes how to downgrade macOS Mojave to macOS High Sierra. Download macOS High Sierra on Mojave First, make sure you dont have any existing High Sierra installers already on your Mac, as Mojaves software update will detect them and refuse to download the latest installer (even if the High Sierra installer you have is an older version from the latest version available on the Mac App Store). Even though Apple hides High Sierra from the Mojave Mac App Store, you can still access the High Sierra download page via this direct link. Depending on your browser, you may need to click allow or open to have the link open in the Mac App Store. This should take you to the macOS High Sierra page in the Mac App Store. Click Get. Since youre running Mojave, clicking Get will launch the new Software Update interface in System Preferences and start downloading the approximately 5.2GB High Sierra Installer. Once its done downloading, the installer will attempt to run but youll receive an error that the installer is too old to run (obviously since youre already running a newer version of macOS). Open Finder and look in the Applications folder to find the installer named Install macOS High Sierra.app. You can now copy this file to another Mac to install the latest version of High Sierra or create a bootable High Sierra installer using a USB drive. What About Downgrading from Mojave to High Sierra The steps above focus on obtaining the High Sierra installer primarily for use on another Mac, not the one that youve already installed Mojave on, but they can also be used to downgrade your existing Mac, albeit with some caveats. You see, theres no built-in, official way to downgrade nondestructively from one macOS version to another. To do so, youd need to use the steps above to download the High Sierra installer and create a bootable USB. Then back up all of your data, boot to the USB installer and use Disk Utility to erase the drive, and then install High Sierra from scratch. For those who dont like the sound of that, but still fear needing to downgrade, one forward-looking solution is to get into the habit of creating bootable backups of your Macs primary drive. Using an app like Carbon Copy Cloner or SuperDuper you can create full bootable backups of your drive. This not only makes normal system recovery much easier, but it also allows you to grab a snapshot of your system just before major macOS upgrades. If you upgrade and find that you dont like the new version of macOS, or if there are issues with application compatibility, you can simply revert to your bootable backup and be back up and running with the old operating system in a matter of minutes. Obviously, the bootable backup strategy doesnt help if youve already upgraded, but its something to consider adding to your maintenance routine to help prevent issues in the future.
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