There are several ways to obtain a serial number and product key for AutoCAD Civil 3D 2016:
If you have a physical copy, the serial number is located on the sleeve or box. Autocad Civil 3d 2016 Serial Number Product Key
If you need help with a specific part of the setup, let me know: There are several ways to obtain a serial
Some licenses are restricted to specific geographic regions. including Civil 3D 2016
Autodesk provides free access to almost all its software, including Civil 3D 2016, for students and educators. You simply need to register with a valid .edu email address. The serial number is automatically populated via the "Sign In" mechanism rather than a typed code.
