LUA is not updating Behavior and Security Heuristics 12.1

My liveupdate administrator version is 2.3.0.71. SEPM is 12.1 RU3. All my SEP clients are running SEP 12.1 RU3. Their virus definitions are updated but the Proactive threat protection was left to July definitions.  Checking on my liveupdate administrator it's not downloading the Behavior and Security Heuristics Update. SEP 12.1 RU2 was selected.

please help.