mv ~/Desktop/Ventura.iso.cdr ~/Desktop/Ventura.iso ISO will be ~12–14 GB. You can zip it:
hdiutil unmount /Volumes/Install\ macOS\ Ventura Convert to ISO (hybrid):
sudo softwareupdate --fetch-full-installer --full-installer-version 13.7 Or get it from the App Store: macOS Ventura on App Store
This creates Ventura.dmg . Double-click to mount it – it appears as a volume named Ventura . In Terminal:
sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/Ventura --nointeraction Wait 10–20 minutes for it to finish. Unmount the volume (but keep the .dmg file):