Upgrade Status for Agent shows Reboot Required, rebooting does not resolve.
The upgrade failed on the endpoint and not all files required were properly replaced.
Verify the versions being reported by the Agent on the endpoint, if they do not match a full uninstall of the Agent and a reinstall will be required.
cd "C:\Program Files (x86)\Bit9\Parity Agent" dascli status
If the versions match please open a case with Support and provide the most recent Agent Upgrade Log from "C:\ProgramData\Bit9\Parity Agent\Logs\ParityHostAgentInstall_TIMESTAMP.log".