sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/HighSierra Use code with caution. Copied to clipboard :
This mounts the blank image so we can write data to it. macos high sierra 10136iso
This OS is no longer receiving security updates. Use caution when browsing or entering sensitive data. sudo /Applications/Install\ macOS\ High\ Sierra
This specific update (10.13.6) was recommended for all users as it improved the stability and security of the Mac. macos high sierra 10136iso