When you uninstall UNICOM Intelligence Interviewer - Server Admin, the uninstallation procedure checks whether there are any other installed products that use UNICOM Intelligence Interviewer - Server Admin and, if not, deletes UNICOM Intelligence Interviewer - Server Admin.

Very occasionally this does not work, and you must uninstall UNICOM Intelligence Interviewer - Server Admin manually before you can install any product that uses it (this might happen if you have previously installed an early test version of a product rather than a release version).