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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.

To ensure a safe installation, you should only download macOS Big Sur through official Apple channels: advertisement macOS Big Sur 11.1 (20C69) Free Download

Advanced users can use the command softwareupdate --fetch-full-installer --full-installer-version 11.1 . Key Features of Version 11.1 (20C69) Apple provides all macOS operating system updates at no cost

This version was the first major point release for Big Sur and introduced several improvements: How to download and install macOS - Apple Support advertisement macOS Big Sur 11.1 (20C69) Free Download