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Q: Can I use the macOS 10.15 Catalina DMG file to upgrade my current installation? A: No, the macOS 10.15 Catalina DMG file is intended for clean installations only. If you want to upgrade your current installation, use the Software Update mechanism in System Preferences.

Open Terminal and enter the following command (replace Catalina if you named your USB differently): Q: Can I use the macOS 10

You will need a USB flash drive with at least of space. How to Install macOS 10.15 Catalina on an Unsupported Mac Q: Can I use the macOS 10