CAMduct is a totally separate install that CADmep.  It would seem you don't have it installed on your machine.  you will also need a CAMduct license.  Some assume if you have a license of CADmep you can use CAMduct.  This is not the case.

Nathan Chapman
Production Manager at General Heating and Air Conditioning

Revit Architecture Certified Professional
Revit MEP Mechanical Certified Professional
Revit MEP Electrical Certified Professional
DynaFabrication Package Author

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