Use the Update Antimalware Agent quick task on selected devices that have Antimalware enforced to ensure those devices have the latest software update for the Antimalware Agent.
To run the Update Antimalware Agent quick task:
Select the device(s) in Devices > Workstations (and sub-folder if applicable) and select Update Antimalware Agent in the Quick Tasks pull-down menu.
Click Start in the Quick Task Status window to start the agent update
You can also run this quick task from the Device Status panel in the Antimalware page on a selected Device.