: You can download the full installer from the Mac App Store or via the Terminal using the following command: softwareupdate --fetch-full-installer --full-installer-version 10.13.6
mv ~/Desktop/HighSierra.iso.cdr ~/Desktop/HighSierra.iso Macos High Sierra 10.13.6.iso
to open these links, as other browsers like Firefox may fail to trigger the App Store. Legacy Macs : You can download the full installer from