To download macOS 10.15 Catalina as a DMG file, it is important to note that Apple primarily distributes full installers as apps through the Mac App Store, not as standalone DMG files.
hdiutil detach /volumes/Install\ macOS\ Catalina
MacBook (Early 2015 or later)
MacBook Air (Mid 2012 or later)
MacBook Pro (Mid 2012 or later)
Mac mini (Late 2012 or later)
iMac (Late 2012 or later)
iMac Pro (2017 or later)
Mac Pro (Late 2013 or later)
MacBook Pro (2012 or newer)
MacBook Air (2012 or newer)
MacBook (Early 2015 or newer)
iMac (2012 or newer)
iMac Pro (2017 or newer)
Mac Pro (Late 2013 or newer)
Mac Mini (2012 or newer)
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