softwareupdate

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Software update in Catalina has the ability to download full installers

softwareupdate --fetch-full-installer

Will download the latest ‘Install macOS’ application to this Mac’s /Applications folder. This is extremely useful for many admin tasks.

softwareupdate --fetch-full-installer --full-installer-version 10.14.6

The --fetch-full-installer flag has a sub-flag: --full-installer-version which allows you to download a specific version.