sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction
C. Verify integrity
You can download the full macOS Catalina installer through the or official support links. Download Macos Catalina 10.15.7 Iso File --39-LINK--39-
If you specifically require an ISO file and cannot create one yourself, community-maintained repositories offer them. These are not authenticated by Apple and carry potential security risks. sudo /Applications/Install\ macOS\ Catalina