External Tools icon in Add-Ins tab and the option to export NWC are missing in Revit
debugging revit add-ins | archi-lab
Navisworks using Switchback with Revit – Cadline Community
The Building Coder: Revit Add-in File Load Exception
Cannot run the external application Collaborate..." when opening Revit
External Tool Failure (Revit Add-in) Revit Cannot Run the External Application "Land F/X", System.IO.FileLoadException (Using One of Our Revit Plugins)