Download a full macOS installer from Terminal — via SS64
softwareupdate can list and download complete macOS installers, including older versions Apple still serves. Useful for making a bootable USB installer or installing on another Mac without hunting through the App Store. This entry only downloads; it doesn't install anything.
Takes effect right away
The easy way
- Run the command to see which installer versions are available.
- Download one with
softwareupdate --fetch-full-installer --full-installer-version 15.7(use a version number from the list). softwareupdate --listshows which updates are pending for this Mac, without installing anything.
Command
Run in Terminal (Applications › Utilities).
softwareupdate --list-full-installersFull installers are several gigabytes, so check your free space first. Delete the installer app when you're done with it.
Sources
- softwareupdate — by SS64
- Source reviewed
- 2026-11-02
- Link checked
- 2026-11-02
- Tested hands-on
- Not by Oddbyte.Me
Oddbyte.Me hasn't tried this on every macOS version, so keep the undo handy.