Fully supported on Windows 10, 11 , and macOS 10.4 or later.

Enhanced failover client packet statistics and data-plane heartbeat modules were added to improve debuggability and prevent false failovers in high-availability environments. Compatibility Matrix

Required for managing ASA 9.18 but is generally backwards compatible with earlier ASA versions (e.g., managing an ASA 5516-X on 9.10).

For users with an active Cisco service contract, the most direct method is through the Cisco Software Download portal: Log in to software.cisco.com using your CCO credentials.