Once downloaded, run the .pkg file. It will extract the official directly into your Applications folder. Method B: Via the Mac App Store
B. From DMG:
If the App Store is giving you trouble, you can use a script to pull the files directly from Apple’s servers. Open . macos big sur dmg download exclusive
Open and paste the following: sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume Enter your password and wait for the process to complete. Security Warning for 2026
: As of September 26, 2023 , macOS Big Sur reached its End of Life (EoL) . It no longer receives official security updates from Apple, making it high-risk for active internet use. Once downloaded, run the
No App Store, no expired certificate, no malware. Just pure Apple-signed code.
softwareupdate --fetch-full-installer --full-installer-version 11.7.10 From DMG: If the App Store is giving
softwareupdate --fetch-full-installer --full-installer-version 11.7.10 2. Creating a Bootable DMG or USB Once you have the "Install macOS Big Sur.app"