Steps to do a clean uninstall of Open Workbench (OWB).
Doing a clean uninstall / install is especially recommended if running into issues during an upgrade of OWB. Sometimes, due to permission restrictions or other issues on the machine, some of the OWB components do not get uninstalled on their own. If that is the case, a manual uninstall is needed to remove the remaining components.
For MSP see: Clean uninstall of the MSP interface