Explanation: If this message appears during the "post setup" step during a Foxhound upgrade, it probably means the Foxhound engine is already running as a service and it cannot be stopped by the post setup process. As a result, the Foxhound upgrade will not work properly.

Try stopping the service and rerunning the upgrade, including the initial "unsetup" step: How do I install a new version of Foxhound?

See also...
How do I install a new version of Foxhound?