softwareupdate --list-full-installers If High Sierra appears, download it with:
git clone https://github.com/corpnewt/gibMacOS cd gibMacOS python3 gibMacOS.py Choose the catalog (e.g., PublicRelease ) and select High Sierra 10.13.6.
open macappstores://apps.apple.com/app/id1246284741?mt=12 macos high sierra 10.13 iso download
Use this direct URL: macappstores://apps.apple.com/app/id1246284741?mt=12 Open Terminal and enter:
hdiutil attach /tmp/HighSierra.dmg -mountpoint /Volumes/HighSierra softwareupdate --list-full-installers If High Sierra appears
hdiutil detach /Volumes/Install\ macOS\ High\ Sierra hdiutil convert /tmp/HighSierra.dmg -format UDTO -o ~/Desktop/HighSierra.iso
hdiutil create -o /tmp/HighSierra -size 8500m -volname HighSierra -layout SPUD -fs HFS+J “highsierra.iso” from mediafire
softwareupdate --fetch-full-installer --full-installer-version 10.13.6 A Python script that downloads macOS installers directly from Apple’s servers without authentication:
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/HighSierra --nointeraction
Do not download ISOs from unknown file-hosting sites (e.g., “highsierra.iso” from mediafire, mega, or torrents). These are often counterfeit or infected. 5. Step-by-Step: Converting the Official Installer to ISO The standard macOS installer is an .app bundle. To make a bootable ISO for VMs or USB: