These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. Type or paste one of the following commands in Terminal.Open Terminal, which is in the Utilities folder of your Applications folder.Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended. Connect the USB flash drive or other volume that you're using for the bootable installer.Use the 'createinstallmedia' command in Terminal It installs an app named Install OS X El Capitan into your Applications folder. Open this file and follow the onscreen instructions. OS X El Capitan downloads as a disk image that contains a file named InstallMacOSX.pkg.It installs an app named Install macOS Sierra into your Applications folder. macOS Sierra downloads as a disk image that contains a file named InstallOS.pkg.Enterprise administrators, please download from Apple, not a locally hosted software-update server. To get the required installer, download from a Mac that is using macOS Sierra 10.12.5 or later or El Capitan 10.11.6.
If the installer opens after downloading, quit it without continuing installation. macOS Catalina, macOS Mojave, and macOS High Sierra download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave or Install macOS High Sierra.
Find the appropriate download link in the upgrade instructions for each macOS version:
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