These download to your Applications folder as an app named Install macOS. Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra.A downloaded installer for macOS 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 To get Mac OS X InstallerApps you can ask help from a friend who has “ real Macintosh” to download it from the App Store. Mac OS Installer retail Version of Yosemite, El Capitan or Mac OS Sierra, choose one you desire to make the bootable USB. The computer will now boot from the selected drive. 3) Select the drive called “Install macOS Mojave Beta” from the Startup Manager using the keyboard arrow keys. 2) Start up the computer whilst holding the Option (⌥) key. 1) Shut down your Mac with the USB drive inserted. How to use the macOS Mojave USB installer. When the macOS installer opens, follow the onscreen instructions. Select the volume containing the bootable installer, then click Continue. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes and a gear icon labled Options. A macOS Catalina USB install drive is a great tool to have on hand to for quick and easy macOS 10.15 reinstalls.
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