OK, with VBAMAN load the DVB. Go to the VBAIDE, if you have more than one loaded make sure the one you want to revise is highlighted in the Project pane. Go to Tools/References, note the there will be at least 2 CivilEngineering3.0, or similar references checked. Uncheck these and scroll down to find the like named references with a 4.0 and check them. Go back to C3D, open the VBAMAN and SAVEAS to save this as a DVB with new name.....this way you can keep both versions if you still also use C3D2006.
HTH