Hi. We don't have enough information about the problem you are trying to solve to advise you that you must unconfigure and uninstall all the software on all servers.
However, if your goal is to remove all of the software and start over, then unconfigure and uninstall must be done on all servers.
The SAS Users Group for Administrators (SUGA) is open to all SAS administrators and architects who install, update, manage or maintain a SAS deployment.