If you get an error “Failed to upgrade application settings. Root element is missing.”, the user.config file may be corrupt. A generic one is attached. Stop the Verex-ID Sentinel Service and replace the attached file in the directory specified in the error pop up. Then restart the Verex-ID service.
You can refer to this guide for help with stopping and starting the Service: https://ids.zendesk.com/hc/en-us/articles/360004138693-How-to-re-start-the-AssureID-service