Although it is recommended to use the latest version of product versions of FSM Connector and Message Broker are not entirely dependant. This means that it is possible to use the newest FSM Connector with one of the older message brokers and vice versa but certain functionalities may not work then like for instance failover mechanism which needs both: the newest FSM Connector and FSM Message Broker
3070721 - Download of FSM Message Broker
If you want to learn about about Message Broker go to FSM Message Broker installation & configuration