Click the Get button. This will open "Software Update" in System Settings.
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You can download the full installer by running the following command in Terminal: Click the Get button
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curl -O http://updates-http.cdn-apple.com/2019/cert/061-39476-20180921-788c1f11-45e1-4693-a69d-0144a4ae18b3/InstallAssistant_highsierra.dmg