10.15.7 Full Installer — Download [exclusive] Macos Catalina

sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume (Replace "MyVolume" with the name of your USB drive.)

Copy and paste the following: softwareupdate --fetch-full-installer --full-installer-version 10.15.7 download macos catalina 10.15.7 full installer