mv ~/Desktop/macOS_Catalina_10.15.7.iso.cdr ~/Desktop/macOS_Catalina_10.15.7.iso
softwareupdate --fetch-full-installer --full-installer-version 10.15.7 --- Macos Catalina 10.15.7 Iso Download
hdiutil convert /tmp/Catalina.dmg -format UDTO -o /tmp/Catalina.iso mv ~/Desktop/macOS_Catalina_10