To install these, double-click the downloaded .dmg file to mount it, and run the .pkg installer package contained inside. How to Create a Bootable USB Installer
Open your web browser and click this direct Mac App Store link for macOS Catalina . download macos catalina 10157 dmg file install
For machines running macOS 10.15.6, get the Standard macOS 10.15.7 Update DMG from Apple. To install these, double-click the downloaded
If you are already running an older version of macOS Catalina and need to manually update it to 10.15.7 without using the App Store, you can leverage standalone update packages. To install these