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Always verify the SHA-256 checksum of third-party downloads to ensure the file hasn't been tampered with. A "better" download is a safe download. Technical Requirements for Catalina

The "better" way to download the macOS Catalina 10.15.7 DMG is to fetch the official installer via the and convert it yourself. This guarantees you aren't installing malware and that the OS will be stable for years to come. download macos catalina 10157 dmg file better

sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction Always verify the SHA-256 checksum of third-party downloads