When you installed an update for server part of the Access Control software you should update installed agents also.
NOTE: you do not need to update agents for Terminal Server editions. Agents will be updated automatically during updating the server part of the software.
Read more about installing and updating agents in "Configuring network" editions section.
See
also:
Configuring network
editions
Install or Update
Agent
Auto
update Agents
Create deployment
package
Uninstall Agent