For a of macOS Catalina, avoid third-party “hot” download sites offering modified DMG files. Use Apple’s official sources instead.
Type: softwareupdate --fetch-full-installer --full-installer-version 10.15.7
: If the App Store fails, open Terminal and run this command to fetch the full installer: softwareupdate --fetch-full-installer --full-installer-version 10.15.7
rather than a standalone DMG file, as Apple does not officially release the full installer in DMG format [10, 11]. Once you have the installer, you can create a bootable USB drive to wipe your Mac and reinstall the OS fresh. 1. Downloading the macOS Catalina Installer
Once the download finishes, the file "Install macOS Catalina" will be in your folder. Do not run it yet. macOS Catalina - App Store macOS Catalina App - App Store.
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.
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