Symantec Endpoint Protection Manager and Symantec Endpoint Protection Windows client versions do not support the following downgrade paths: 2015 - Release Update 2 (RU2), with or without maintenance patches 157 - Release Update 1 (RU1), with or without maintenance patches 95 Small Business Edition - Release Update 1 (RU1) From 11.x to 12.1.4 (enterprise version) The following Symantec Endpoint Protection Manager versions and Symantec Endpoint Protection Windows client versions can upgrade directly to version 12.1.4: New fixes and features in Symantec Endpoint Protection 12.1.4 Release Notes and System Requirements for all versions of Symantec Endpoint Protection and Symantec Network Access Control > SEPM Manageability enhancements – Allowing immediate critical security event notification and additional telemetry. > Mac client support for 4 additional localized languages Simplified Chinese, Traditional Chinese, Korean, and Brazilian Portuguese. > Additional Mac client features – New client UI, Update to LiveUpdate 6, Scheduled Scan options parity with Windows, and changes to Mac client packaging to support better distribution via third party deployment tools. > Support for Microsoft Windows 8.1 and Windows 2012 R2. If the signatures match, the packet is not allowed to go further in the TCP/IP stack. > Mac IPS protection – Network Intrusion Prevention System based on signatures where each payload in network packet is inspected and compared against a known network attack. This release provides extended Mac protection, Mac OS 10.9 support, Microsoft Windows 8.1 support, and security improvements, by including the following new features:

Symantec version