Symantec™ Endpoint Protection and Symantec Network Access Control 11 Release Update 7 MP3 Release Notes
https://www.symantec.com/business/support/index?page=content&id=DOC6158
Migrating to Symantec Endpoint Protection 11.0.7300 (RU7 MP3)
https://www.symantec.com/business/support/index?page=content&id=TECH199189
*Symantec Endpoint Protection 11 RU7 MP3 can only be upgraded from RU7, RU7 MP1, or RU7 MP2. Do not upgrade this release over earlier versions. It must be installed over RU7, RU7 MP1, or RU7 MP2.
*Windows 8 is not supported