Workstation setup on new server - error re path to old server

Have a client trying to install the workstation for 2013 Std to a pc that apparently had Sage 100 installed before and was not completely uninstalled.  They have a different server now and the workstation install errors out indicating it can't find the path on the OLD server, although they are running Autorun.exe from the NEW server.  SO even if we wanted to attempt to uninstall the old version again, we can't even do that.

Gotta be some registry entries somewhere...?