Inside the disk image is an installer named InstallMacOSX.pkg.Download using Safari, and open the disk image on a Mac that is compatible with OS X El Capitan.The installer for OS X El Capitan downloads to your Downloads folder as a disk image named InstallMacOSX.dmg. Download on a Mac that is using macOS Sierra 10.12.5 or later, or OS X El Capitan 10.11.6.
Download on a Mac that is compatible with that version of macOS.If the installer opens after downloading, quit it without continuing installation. The installer for macOS Monterey, macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra downloads to your Applications folder as an app named Install macOS. A downloaded installer for macOS Monterey, Big Sur, Catalina, Mojave, High Sierra, or El Capitan.A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14GB of available storage.What you need to create a bootable installer You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time. These advanced steps are primarily for system administrators and others who are familiar with the command line. You can use an external drive or secondary volume as a startup disk from which to install the Mac operating system. How to create a bootable installer for macOS
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