First you need to upgrade to RU6a, and then to RU6 MP2.
Not sure if you need to apply PP1 or not though!!
There are 2 changes in PP1:
1.) Verisign implementation
User Authentication Product console control through the SPC
2.) SAV For Linux Reporter
SAV for Linux (SAVFL) Reporter provides log records and inventory information to the Symantec Endpoint Protection Manager via its legacy reporting channel. This allows you to monitor and report on SAVFL client activities from the Symantec Endpoint Protection Manager console.
Unless you utilize either of these functions or products it is not required for you to implement RU6 MP2 Point Patch 1 in your environment. The changes will be present in the next full release as well.
To download RU6a, you have to contact technical support, as they will give you that. Just ruyn the SETUP, and upgrade SEPM.
Then, you can go to fileconnect.symantec.com, and download RU6 MP2, and run it's setup, to upgrade SEPM to RU6 mp2