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softwareupdate --fetch-full-installer --full-installer-version 10.13.6 Update Files: download macos high sierra 1013 6 dmg file link
Below is the guide to obtaining the official macOS High Sierra files directly from Apple. 1. The Official App Store Method do not run the installer
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Confirm the download. Once finished, do not run the installer; it will be located in your /Applications folder. 2. Using "Mist" to Download Directly