Yes, I have all versions. No, I can't help you. Revit does not, has not, and will probably never save down to a previous version.
You can export to IFC and then open the IFC file in the older version of Revit, but this is only going to bring in the geometry, much of the "Revitness" of the file is going to be lost during the conversion.
If it would lose the 3d perspectives then I don't think I'll try that.. Thanks for the help!