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Once finished, you can restart your Mac while holding the key to boot from the USB drive.

Note: If the App Store says "Update not found" or redirects you to a newer OS, you must use Option 2. catalina 10.15.7 download dmg

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Apple typically distributes macOS installers through the or Software Update rather than as a standalone DMG. Microsoft Community Hubhttps://techcommunity.microsoft.com macOS Catalina dmg file download for old macbook pro