Downgrade the JRE on the agent server to the same release as is installed on the orchestrator.
For instance, if you have JDK 1.7 update 80 on the orchestrator server, install this same release JRE 1.7 update 80 on the agent server.
You must uninstall the 1.8 JRE first.
Once you install the 1.7 JRE, open the file c2oagtsvcw.conf located under C:\Program Files\CA\PAM Agent\PAMAgent and modify line number 5. For example from this:
change it to this:
Verify the path before making the update.
Save the changes, close the file and restart the agent.
When you log into CA Process Automation, from the configuration screen you should now see the agent. If it is not immediately shown, select Agents, right click and refresh.