Please follow iClarified on Twitter, Facebook, Google+, or RSS for more Apple news, tutorials, and videos. You'll be presented with a list of bootable drives. You may now restart your Mac and hold down the Option key after hearing the boot sound. Press Option/Alt as you start up your Mac.

You will be asked to enter your Administrative account password.Īfter about 30 minutes the creation of your USB Install Key for macOS High Sierra will be complete. Similarly, if you installed High Sierra on a Mac with an SSD and wanted to revert to Sierra. Sudo '/Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia' -volume '/Volumes/Untitled' Please note this will erase the entire USB key. Once you've verified that you have the full installer, launch Terminal from the Applications:Utilities folder.Įxecute the following command in the Terminal window replacing 'Untitled' with the name of your USB key. If it's tiny (~20MB), you can either run it to install High Sierra and then redownload the installer or delete it, upgrade to the latest version of Sierra from the Mac App Store Update tab, then redownload the installer. Press Command+i on the keyboard and verify its size. Open your Applications folder and select the 'Install macOS High Sierra app. It appears as though the full installer is only being provided to those on the latest version of Sierra 10.12.6 and users already on High Sierra 10.13. Unfortunately, users have reported that the App Store is providing them with a stub installer that downloads the files it needs during the installation process. You may notice that download is very quick. Once the installer launches, press the Command+Q keys on the keyboard to exit.

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