You are safe to upgrade once all of the 'Knowledge Object' panels (the ones below the linechart panel) show nothing. The main documentation to read (that is the basis for this app) is here: https://docs.splunk.com/Documentation/WindowsAddOn/latest/User/Upgrade. For support with this app or ANY OTHER SPLUNK ASSISTANCE INCLUDING HEALTH-CHECKS AND PROFESSIONAL SERVICES, contact Splunxter at Woodcock@Splunxter.com.