Here is a link to the main Autodesk Knowledge Network page for Civil 3D Country Kit selection list for all countries. The Civil 3D Country Kits have now been released but have been moved to new and more easily accessible location in your Autodesk.
 
 

Autodesk autocad civil 3d 2018 country kits free.GRAITEC Blog

 
Here is a link to the main Autodesk Knowledge Network page for Civil 3D Country Kit selection list for all countries. The Civil 3D Country Kits have now been released but have been moved to new and more easily accessible location in your Autodesk.

Civil 3D Country Kits for United Kingdom & Ireland | Civil 3D | Autodesk Knowledge Network.US Country Kit for AutoCAD Civil 3D | Article | cadpilot

 
Autodesk River and Flood Analysis Module for AutoCAD Civil 3D , HEC-RAS (Subscription) External, 87MB, Download, Civil 3D – country kit. At last count, 22 of these were available to download for free from the Autodesk Knowledge Network. Although they are referred to as “Country”. CAD Forum – Download CAD files and utilities.