Zenworks 10.3 - 11.1a

The documentation states that it will decommission my current reporting server. This does not appear to happen. I get an error message after it finds my current reporting server that says:

ZENworks Reporting Server has been installed on this device. You must uninstall it before proceeding with the installation. I definitely do not have a 11.1 reporting server.

How can I force this uninstall?