The Autodesk Civil 3D Object Enabler is available on your product media as well as from the Autodesk website.
See the instructions below for installing the Autodesk Civil 3D Object Enabler from the product media. In addition, you can also download the most current version from the Autodesk web site at https://www.autodesk.com/aecobjenabler.
Installing the Autodesk Civil 3D Object Enabler