This info was taken from the Symantec File Connect file selection page.
Symantec Endpoint Protection RU6 MP1 (11.0.6100) provides customer fixes since the release of RU6 and RU6a. This maintenance patch cannot be installed over any versions of Symantec Endpoint Protection or Symantec Endpoint Protection Manager prior to RU6. It must be installed over RU6 or RU6a.
I don't know if 11.0.6100.645 is the base product or the Inline Update. Maybe someone else does.