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A step-by-step guide to blocking macOS Tahoe (macOS 26) upgrade notifications and the red badge on System Settings using a device management configuration profile. The method leverages the Stop Tahoe Update GitHub project, which installs a 90-day deferral policy via a .mobileconfig file. The guide fills in missing steps from the project's README, including making scripts executable, generating UUIDs for the profile, and optionally disabling deferral of minor updates. A zsh alias is also provided to easily reinstall the profile every 90 days.

Block the “Upgrade to Tahoe” alerts and System Settings indicator – The Robservatory