About model and data exchange with 3rd party solutions: Revit, Solibri, dRofus, Bluebeam, structural analysis solutions, and IFC, BCF and DXF/DWG-based exchange, etc.
If you have both AC and C4D then install the Cinema4D Add-On. You can then launch C4D from within AC. Anything added to the C4D file is returned to AC as a GDL object.
The old Maxonform plugin (which was not free) was based on R9, however the new free plugin is based on R10.1 (i think). You would have to ask GS about an R9 version .. i don't think it will be a positive reply though.