Download a copy of MacOS Big Sur to an external drive

I want to download a copy of my existing OS Big Sur from the App store to an external drive instead of it trying to download and auto-install directly to my existing system drive. From the App store, there is only a "get" button which triggers the auto-install on my Mac. How can I just download it and choose where it downloads to?

Posted on Oct 10, 2022 1:16 PM

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3 replies

Oct 10, 2022 1:49 PM in response to houstonalle

Follow previous advise First.


Another method involves running a Terminal script to download the Full Version of Bug Sur 11.7.


It will effectively do the same as pervious posting except it will not auto launch.


Terminal command below without Quotation Marks.


Suggest, Copy and Paste the command to make sure it will work on first attempt - if going this route.


" softwareupdate --fetch-full-installer --full-installer-version 11.7 "

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Download a copy of MacOS Big Sur to an external drive

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