Apple provides all macOS operating system updates at no cost. If you see an advertisement or a third-party site asking for payment for this specific download, it is likely a scam or a "pirated" distribution that could contain malware.

Go to System Preferences > Software Update on your Mac.

To ensure a safe installation, you should only download macOS Big Sur through official Apple channels:

macOS Big Sur 11.1 (build 20C69) was officially released by Apple on . It is a legitimate, free software update for all users with compatible Mac devices. Why Is It "Free"?

Advanced users can use the command softwareupdate --fetch-full-installer --full-installer-version 11.1 . Key Features of Version 11.1 (20C69)

 
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