Extract the file and run gibMacOS.command (on Mac) or gibMacOS.bat (on Windows).
To ensure your download isn’t corrupted (matching Apple’s original checksums), run this in Terminal:
This creates a perfect, bootable, high-quality recovery drive.
Always ensure you're downloading software from trusted sources to avoid malware. If you're purchasing or downloading macOS from anywhere, make sure it's directly from Apple or an authorized reseller.
Look through the list to verify that version 10.15.7 is available for your machine.
Drag and drop the downloaded Catalina installer file from your Applications folder directly into the Terminal window to auto-populate its file path.
softwareupdate --fetch-full-installer --full-installer-version 10.15.7 Use code with caution.
