Change Auditor Coordinator Install

Client had started an install of Change Auditor Coordinator on a server, but it had failed ( I do not know what caused it to fail).  They then removed Change Auditor software and deleted the SCP.  They then went a created a new Change Auditor Coordinator server.  Now, they are wanting to add another Coordinator server back on the first server, but when running the install, it shows the failed Coordinator and does not allow to add a coordinator to the server, how do you get rid of all references on the server of the old failed coordinator instance?