Thanks for the reply;
FYI: I recently joined this organization and the guy who used to maintain VMware is no more working here. So I have no history or documents that can tell me what was in place. When I observed the Programs and Features at Primary site, I see no Update Manager, whereas, the Secondary site has one.
So as per your answer, I believe that I need to install Update Manager at Primary site as well. Correct me if I am wrong.
Thanks