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. 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. 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. What you should see next is a bunch of entries, each telling you how long it’s been since you last rebooted or started up your Mac, as shown in the screenshot seen below. dmg file to open it and see the package (.pkg) file within.ĭouble-click the. Open Terminal, and to get your Mac’s current uptime, type the following in Terminal and press the enter key: uptime. Use these links to download a macOS disk image (.dmg) file.ĭouble-click the.
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