Open Revit and run this command. The result is a CSV file created in your %TEMP% folder and opened in your default application for viewing CSV files. This app will generate a report of all keynotes in your Revit, with information about the user, material, and element keynotes and which keynotes are orphaned.

The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin.

To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8/8.1/10) and uninstall as you would any other application from your system.