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Softwareupdate -fetch-full-installer -full-installer-version 10.15 Remember to replace **.**.* with the version you want to download, for example to download the full macOS Catalina installer the syntax would be: Hit return to start downloading the full installer application of that version of MacOS.Softwareupdate -fetch-full-installer -full-installer-version **.**.* Launch the Terminal application as usual, then use the following command syntax, replacing “**.**.*” with the installer version you wish to download:.How to Download Full MacOS Installer from Mac Command Line This particular –fetch-full-installer flag for the command line softwareupdate tool is only available in MacOS Catalina 10.15 and later versions of MacOS, so if you’re trying to use this from Mojave or earlier it will not be available and you’d have to rely on other methods to download full macOS installers instead.

With this particular trick, you can download complete “Install MacOS” application packages directly from the Terminal application, and it works to get full installers of macOS Monterey, macOS Big Sur, Catalina, Mojave, and High Sierra too.