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Once completed, you will be greeted by the macOS Setup Assistant. You can choose to restore your data from a Time Machine backup or set it up as a new Mac.

Run the .pkg file inside to install the "Install macOS Catalina.app" into your /Applications folder. Once completed, you will be greeted by the

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By following this guide, you will have a clean, fast installation of macOS 10.15 Catalina. To make sure you get the right file, could you tell me: Restart the Mac and immediately hold down the Option ( ) key

Plug the USB into the target Mac. Restart the Mac and immediately hold down the Option ( ) key . Select the "Install macOS Catalina" volume.

A involves erasing your hard drive entirely and installing the operating system from scratch. This is vastly superior to an "upgrade" or "reinstall" because it:

Now that you have a bootable installer, follow these steps to clean install Catalina: