I'm probably having an issue here understand the System Update feature. Is System Update used to deploy the new agent out to workstations?

I have machines that have ZCM Agent 10.3, and I recently added a new 11.2 zone and have been moving the machines over. Even though their agents are registered to an 11.2 zone and server, their agents to not update.

The server is the ZCM prebuilt application. In the system updates section, all I have listed is the OCT 2013 PRU update, and it has been baselined. I can create stages, but I cannot deploy system updates. All options in the deploy section are greyed out.

How would I go about updating the agents for these workstations?

Pardon my lack of knowledge, I'm just a junior IT guy at a very small company!