Create a Bootable macOS High Sierra USB Installer

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Download and use the High Sierra Patcher to get the High Sierra Installer;

http://dosdude1.com/highsierra/

To create a bootable macOS High Sierra USB installer:

1. Connect and name the USB to “HighSierra”

2. Launch Terminal

3. Copy and paste the following command into the Terminal window:

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/HighSierra