Installation → Installing Servers and Agents → Agent Installation → About Agent Upgrades
After upgrading to a new version of the server or receiving notice of available agent upgrades, you can upgrade your agents from the Deployment Automation user interface.
The agent installer does not upgrade agents. It lets you install a different version of the agent on the same machine that runs in parallel with any existing agents. When installing a second agent on the same machine, you must specify a unique port number, as the installer does not check to see if the port number is already in use by another agent.
For details on upgrading the server, see the Release Notes Upgrades tab. The Release Notes are posted on the Documentation Center.
For details on upgrading the agent, see Upgrading Agents.
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