for High Sierra. You must create one using the downloaded installer app. Microsoft Community Hub Prepare a USB Drive:
: 2GB of RAM and roughly 14.3GB of available storage. Supported Models : MacBook / iMac : Late 2009 or newer. MacBook Air / Pro / Mac mini : Mid 2010 or newer. Mac Pro : Mid 2010 or newer. 2. Download the Full Installer download macos high sierra 10136 dmg mac top
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume for High Sierra