After downloading, the installer named Install macOS Catalina.app will be in your Applications folder. 2. How to Create a DMG from the Installer
After downloading the installer:
If you are on a Mac running macOS 10.15 or later, you can bypass the App Store and use the Terminal to download the full installer: Macos Catalina Dmg Direct Download
: Perfect for hardware that can't run Big Sur or Monterey. Macos Catalina Dmg Direct Download
Apple does not officially release macOS Catalina as a standalone file for direct download . Instead, they provide a full installer application through the App Store or minor update patches in DMG format. Macos Catalina Dmg Direct Download
Apple’s catalog URL can be used, but it requires parsing XML. Simpler: use or installinstallmacos.py :