Once the download is complete, the installer will automatically open. You can close it at this stage if you wish. You will find the installer application, named Install macOS Catalina , saved in your main folder. This .app file is the functional equivalent of a DMG file and can be used to create your bootable USB installer or run a clean installation.
After getting the official .app from Apple, follow Method 1 above to convert it into a bootable DMG in under 10 minutes. Macos Catalina Dmg Direct Download
This downloads the full installer app directly from Apple’s servers. Once the download is complete, the installer will