- The most likely cause is that you have installed the wrong Keynote Manager application. Keynote Manager is available as a standalone application and a Revit integrated application; the standalone runs as a standard Windows program and has no direct connection with Revit where the Revit integrated application runs inside of Revit. Because of this the standalone application will create a start menu shortcut but will not show up inside of the Revit UI; the Revit integrated version will show up inside of Revit but will not create a start menu shortcut.
- It is also possible that you have a version of Revit that is not supported. Revit LT does not support external commands so if you are running Revit LT the Revit integrated version will not work. Also if you are running a version that is older than the supported versions (see here) the application will no longer show up. Note that in either of these cases the standalone application will still work fine. If you are using an unsupported version of Revit then the standalone application may better serve your needs.