Add-on ribbon tab has disappeared in Excel
If you open Microsoft Excel and cannot see the Data Everywhere ribbon tab, you may need to re-enable the add-in. Follow the directions in the relevant article listed below, depending on your Excel version.
In certain cases, re-enabling the Data Everywhere add-in may not be enough. If you continue to have problems with the Data Everywhere ribbon tab disappearing when Excel is restarted, please follow the instructions below in "Debugging VSTO startup issues", and be sure to pass on any received dialog box messages to Data Everywhere support so we can help troubleshoot and diagnose the issue.