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 AssureID Service and replace the attached file in the directory specified in the error pop up. Then restart the AssureID service.
You can refer to this guide for help with stopping and starting the Service: https://aidd.zendesk.com/hc/en-us/articles/235480008-Restart-the-Service-Step-by-step-guide-