: hdiutil convert /tmp/Catalina.dmg -format UDTO -o ~/Desktop/Catalina.cdr
: sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction macos catalina 10157 iso download new
If you cannot use a Mac to create an ISO, these third-party sources host pre-compiled bootable ISO files. : hdiutil convert /tmp/Catalina
To install macOS Catalina 10.15.7, follow these steps: follow these steps: