If not available, you can still download it using this terminal command (works as of 2025):
Open the and search for "macOS Catalina." Click Get to download the installer to your /Applications folder. It will be named Install macOS Catalina.app . 2. Use the Terminal to Build the Image Open the Terminal and run these commands one by one: macos catalina iso
The most secure method is to build the ISO yourself using a Mac. This ensures the file is free from malware or unauthorized modifications. 1. Download the Installer If not available, you can still download it
If you have an ISO but want to create a bootable USB for a physical Mac, you will need to restore the ISO to a USB drive using the app on a Mac (Restore feature) or use a tool like BalenaEtcher . Use the Terminal to Build the Image Open
Find the artist or organization you are interested in