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Terminal will unmount, format, and copy the required installer resources onto your drive. Keep the window open until you see the message: "Install media now available at /Volumes/Install macOS Catalina" . Step 5: Boot Your Mac from the USB Installer

How to Download the macOS 10.15 Catalina DMG File for a Clean Installation

Ensure your hardware is compatible:

Choose APFS (or Mac OS Extended (Journaled) if APFS isn't available). Scheme: Choose GUID Partition Map . Click Erase Group (if applicable) or Erase . 3. Install macOS Catalina Close Disk Utility. Select Install macOS from the utility menu.

This gives you a DMG containing the Install macOS Catalina.app . Double-click the DMG, then drag the app to your Applications folder.

The Catalina installer requires several gigabytes. Delete old files, empty your Trash, and uninstall unused apps to make room.