Typically you load the latest service updates on the BCM, and the client is included as part of that update. Assuming BCM 4.0, you would install the latest desktop service update, then download/install the RCC client from the BCM after the update is applied.
I think the same logic applies for BCM 3.6 or 3.7 systems.
I believe the latest RCC version is 2.4.360 something or another.