Open the macOS Big Sur page on the Mac App Store. Click "Get" to download the installer to your /Applications folder.
hdiutil attach /tmp/BigSur.dmg -noverify -mountpoint /Volumes/BigSur mac os big sur dmg
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume Open the macOS Big Sur page on the Mac App Store
Note: If you are on a newer version of macOS (like Monterey or Ventura), the App Store link might redirect you. You may need to use a third-party tool like or the softwareupdate terminal command to fetch the specific Big Sur installer if the App Store link is hidden. You may need to use a third-party tool
In this guide, we’ll walk you through the safest ways to get the installer and how to package it into a DMG. 1. Download the macOS Big Sur Installer
There are two primary ways to get the Big Sur DMG file.