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When you install CAMduct you get the 'Autodesk Fabrication Database Migration' tool that you can find from the Windows Start menu. I have had varied success using it. Makes a good starting point to clean up your database.

The version of Revit and CAMduct/ESTmep/CADmep installed need to be the same year. I don't think the version of the database matters although I would always migrate so they are all nicely aligned.