macOS Version Deprecation Policy 

To deliver a consistent user experience, we deprecate support for macOS versions once a year, typically in September or October. At the same time, we optimize our app for the most recently released macOS version. This article contains the most up-to-date information on upcoming deprecations and the current state of supported OS versions.

Last Compatible Version

An LCV (last compatible version) is a stable release for older macOS versions. It's the last version that will be available for devices that are running a deprecated macOS version.

Currently supported versions