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. The IPSW files can be downloaded from websites like, but apparently there is no official way to install such an upgrade, as Apple no longer signs these firmwares. 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. My last app will drop support for iOS 11 soon, and so Id like to upgrade an iPhone SE that runs iOS 11 to iOS 13. 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. dmg file to open it and see the package (.pkg) file within.ĭouble-click the. Use these links to download a macOS disk image (.dmg) file.ĭouble-click the.
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