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To download and install Big Sur 11.6 for free, your device must be on the official compatibility list: macOS Big Sur 11.6 is Out! - What's New?

It addressed a vulnerability where processing a maliciously crafted PDF could lead to arbitrary code execution, an issue known to have been actively exploited. Build Number: 20G165. advertisement macOS Big Sur 11.6 Free Download

The 11.6 update was a maintenance release focused on patching a major zero-click exploit (CVE-2021-30860). To download and install Big Sur 11