Symantec Endpoint Protection 12.1.RU4 Small Business Edition has been released on 28th October 2013.
Previous release details are available here: https://www-secure.symantec.com/connect/articles/what-are-symantec-endpoint-protection-sep-versions-released-officially
You may find the latest release notes & fix notes here:
Symantec Endpoint Protection Small Business Edition incorporates many of the features from the enterprise edition. It is designed for small-to-medium businesses with up to 250 clients. Previous version used to support only 100 computers.
SEP 12.1 SBE provides several improvements over previous versions, including additional operating system, platform, and browser support, improved installation process, streamlined performance, enhanced management features, and new support for virtual environments.
To download Symantec Endpoint Protection 12.1.RU4 go to: https://symantec.flexnetoperations.com/control/symc/registeranonymouslicensetoken
This build's version is: 12.1.4013.4013.
Screenshot is attached to the reference.
Key features of this build:
Expanded operating system and browser support
Supports Mac OS X 10.9 and Windows 8.1 / Server 2012 R2.
Supports the latest versions of Internet Explorer, Firefox, and Chrome.
Expanded and improved features for Endpoint Protection for Mac
Improved remote deployment features for the client, including a standardized deployment package for use with third-party client management systems that supports unattended, logged out, and silent deployment.
Intrusion prevention for Mac client computers.
LiveUpdate 6 for Mac, which does not require Java and can run with no user logged in.
Content for Mac from Symantec Endpoint Protection Manager (SEPM)
Other improvements including improved scheduled scan options, user interface improvements, and language support
Faster alerting and notification for priority events
SEP 12.1.4 Windows clients can quickly send priority events to SEPM without waiting for the next heartbeat. You can create notifications without a damper for critical events. Priority events include malware detections and IPS alerts
If having Small Business Edition 12.0 then can refer the following article to complete the upgrade process though it's stating upgrade to RU3, it will be very similar for an upgrade to RU4 as well.
Article: "Upgrade process graphical overview: Small Business Edition 12.0 to Small Business Edition 12.1 RU3 version"
Supported Upgrade path:
SEP SBE 12.0 > SEP SBE 12.1 (SBE Upgrade)
Keeps the same license
SEP SBE 12.O or SBE 12.1 > SEP 12.1 (EE upgrade)
Remove old licenses, adds and activates upgrade license
Other helpful links:
What's new in Small Business Edition 12.1
Knowledgebase Articles for Symantec Endpoint Protection 12.1.4(RU4):