Im trying to register my recently downloaded 2009 version of Revit Struct online. I am told that I need my product code which I only recieved a serial number from the email I got from autodesk after downloading the program. I understand that I can get that from the help section after opening the program. I open the program, open the help section, click the register tab and a warning box tell me that the perameter is incorrect. Where do I go from here?