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 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/235480008-Restart-the-Service-Step-by-step-guide-