If you need Civil 3D for , Autodesk provides a legal workaround:
: The 64-bit architecture provides noticeably faster load times and "brisker" screen rendering for Feature Style representations like Plan, Profile, and Section. Autocad Civil 3d 2013 64 Bit- Free Download
You will still need a valid serial number and product key to activate the software. Without a license, it runs as a 30-day trial at most. If you need Civil 3D for , Autodesk