Note: These initial instructions are not to downgrade from Mojave to High Sierra but to download High Sierra to use on another Mac. This TechJunkie tutorial will show you the process of downloading macOS High Sierra. Thankfully, there’s still a way to download High Sierra on a Mac running Mojave, even if Apple doesn’t make the process clear. We here at TechJunkie even discussed the issue in an article about the problems with frequent updates need for Apple to tap the brakes: Apple’s Frequent Update Experiment Has Failed – It’s Time for Another Snow Leopard. Reasons for doing so may include downloading an installer for another Mac that has limited or no Internet access, troubleshooting another Mac that won’t 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. 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. The idea is that once you upgrade to the latest version of macOS there’s no going back to using an earlier version. For example, once you’re running macOS Mojave, you won’t see the macOS High Sierra page listed in the Mac App Store, nor will it show up in App Store search results. To ensure that everything goes smoothly, we'll take the extra step of deleting your existing partition before installing macOS.How to Download macOS High Sierra From macOS MojaveĮver since Apple started using the Mac App Store to distribute operating system updates, the company hasn’t made it particularly easy to access older versions of macOS. Once your installation files have been copied, it's time to install macOS from scratch. Once you hit Enter, you'll need to enter your admin password to approve the command, and then hit "Y" on your keyboard to confirm that you're OK with the contents of the USB drive being overwritten. Here's another example that creates a macOS High Sierra install USB on a drive named "MacOS Installer": sudo /Applications/ Install\ macOS\ High\ Sierra.app/ Contents/Resources/createinstallmedia -volume /Volumes/MacOS\ InstallerĬommand to list all connected volumes, which will include your USB installation medium in case you need to check the label. For example, "Install macOS High Sierra.app" would become Install\ macOS\ High\ Sierra.app Be aware that any spaces will need to be preceded by a backslash. You can change various parts of this command to suit your own circumstances, with the main one being the name of the installer. Sudo /Applications/ Install\ macOS\ Big\ Sur.app/ Contents/Resources/createinstallmedia -volume /Volumes/macos_installer You can find out which Mac you have by clicking on the Apple logo in the top-left corner and selecting "About This Mac" to see the name and year of release. If you're not sure what your Mac came with, head to Apple Support and search for your exact model. Your Mac's "earliest" supported version of macOS is the one that it came with. Older versions were written for Intel chips, which use the x86_64 instruction set, while the newer Apple Silicon chips use the ARM instruction set. It's common knowledge that new macOS releases often drop support for older hardware, but the same is true for newer Mac models and older software, too.įor example, you cannot install any version of macOS prior to Big Sur (released in 2020) on a Mac with an Apple Silicon chip, including the M1. It's important to understand that not all versions of macOS (or Mac OS X) work with all hardware configurations. While the process is pretty straightforward, getting your hands on older releases of macOS isn't so easy.
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