How to Re-Download macOS Big Sur Installer from macOS Big Sur
Need to re-download a complete macOS Big Sur installer application, from a Mac running macOS Big Sur? If you’ve already installed and updated a Mac to Big Sur, you may find that trying to re-download it from the Mac App Store doesn’t always work, as it sometimes will simply loop you back to System Preferences, or not be available at all.
Not to worry, as it’s easy to download macOS Big Sur from macOS Big Sur by using the command line as we’ll show you.
Re-downloading macOS Big Sur from a macOS Big Sur Mac
The simplest and most reliable way to redownload macOS Big Sur directly from macOS Big Sur is by using the command line. Assuming you’re currently on a Mac running Big Sur (11.0 or later) here is all you need to do:
- Open the Terminal application (hit command+Spacebar and type Terminal, then hit return, or launch it directly from Utilities)
- Type the following command:
- You’ll see a “Scanning for installer” message soon followed by a percentage indicator of the download, when finished downloading you’ll see “Install finished successfully”
- Open the /Applications folder on the Mac to find the macOS Big Sur installer application
The complete installer appears in the Applications folder, just like it would if you were updating an older macOS version.
Another option is to use a third party tool like MDS to download complete macOS installers, including Big Sur, but if you’re looking for a quick option that doesn’t require any additional apps, the command line is fairly simple.
For what it’s worth, you can also use the use the softwaredate –fetch-full-installer flag to download macOS installers of other versions too, but obviously that’s beyond the scope of this article but you can read about that if interested. You can also get macOS installers from the App Store, but presumably you already tried that with Big Sur and that didn’t work in this situation.
Do you have another method to re-download macOS Big Sur? Let us know in the comments.