How to update agent when upgrading from 8.0 to 8.1?

How to update agent when upgrading from 8.0 to 8.1?

We are in the process of preparing to upgrade from 8.0 to 8.1. How do we update the agents on all of our machines? Do we need to uninstall the old agent and deploy the new one? Or will the new agent update all the old agents? Is this an automatic process or do we need to manually update the agents? Thanks!

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