![]() The Mac must also be using macOS High Sierra or later, the latest version of macOS Sierra, or the latest version of OS X El Capitan. To download an installer suitable for creating a bootable installer, use the App Store or use a web browser to download from a compatible Mac. An official DMG of High Sierra (downgrading from Mojave) Today I attempted to download and install High Sierra from the App Store (the correct method), and in the middle of the installation I was greeted by the warm message about 'Install OS is too old to run' or something very similar. If that doesnt work, try starting up in FireWire Target Disk Mode from your older MBP. ![]() Try starting up from High Sierra on the external drive you made by holding the Alt (option) key. Follow the onscreen installation instructions.Ī bootable installer can be useful if you want to install macOS on multiple computers without downloading the installer each time, or when you can't install using the other methods. Attempting to or reformatting a failing or failed drive, will just make recovering the data that much harder. Open your Applications folder and double-click the macOS installer, named Install. pkg file, then follow the onscreen instructions to install the macOS installer into your Applications folder. ![]() I want to remove any installers that may have been previously downloaded from. dmg file to open it and see the package (.pkg) file within.ĭouble-click the. Cornoir Im pushing the latest version of the installer to all of our machines. Use these links to download a macOS disk image (.dmg) file.ĭouble-click the.
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