You can download the latest version of macOS Catalina from the Mac App Store using the following link: https://apps.apple.com/us/app/macos-catalina/id1466841314?mt=12
You can also use Terminal to download the full Catalina installer using the command below. Once finished, you can find the installer in your Applications folder with the name "Install macOS Catalina".
softwareupdate --fetch-full-installer --full-installer-version 10.15.7
Expert users can use the following sucatalog link to retrieve the required components. Check out gibMacOS for an automated tool.
To create a bootable macOS Catalina USB Installer, follow this tutorial:
● How to Make a Bootable macOS Catalina USB Install Key [Video]
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