Most of the time, you can re-download the current version of macOS via the Mac App Store, and older ones via these links:
However, I’ve run into a situation several times where the Software Update mechanism simply refuses to initiate a download:
Thankfully, macOS installers can be downloaded via Terminal in macOS Catalina. This command will download the most recent version of macOS, depositing it in your Applications folder:
Download macOS Updates From the Terminal Without Installing. There’s no way, in the Mac App Store, to download an update manually without also triggering the installation. That’s annoying, but you can work around this using the Terminal. First, list all the available updates using softwareupdate -l, like we did above. ITerm2 is a replacement for Terminal and the successor to iTerm. It works on Macs with macOS 10.14 or newer. ITerm2 brings the terminal into the modern age with features you never knew you always wanted. Why Do I Want It? Check out the impressive features and screenshots. If you spend a lot of time in a terminal, then you'll appreciate all the. Terminal is a versatile command line system that comes with every Mac computer. Here's how to open Terminal on a Mac, with a few commands you can use. Terminal is a versatile command line system that comes with every Mac computer. Here's how to open Terminal on a Mac, with a few commands you can use.
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The Windows Terminal is a modern, fast, efficient, powerful, and productive terminal application for users of command-line tools and shells like Command Prompt, PowerShell, and WSL. Its main features include multiple tabs, panes, Unicode and UTF-8 character support, a GPU accelerated text rendering engine, and custom themes, styles,.
softwareupdate command has some neat tricks up its sleeve, as pointed out by Armin Briegel:
--fetch-full-installer flag has a sub-flag:
--full-installer-version which allows you to download a specific version.
During my testing in the Catalina beta version I was able to download 10.15, 10.14.6, 10.14.5, and 10.13.6. I was not able to test if 10.13.6 would download the hardware specific build of 10.13.6 for the 2018 MacBook Pro, since I do not have that hardware.
So, to pull 10.13.6 down, you’d use:
softwareupdate --fetch-full-installer --full-installer-version 10.13.6
I wish Apple would just have a support document up with direct downloads for all of this stuff, but this tool is not a bad alternative.
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Update: Don’t miss this documentation from JAMF for more on the subject.