You're looking for a useful feature on Autodesk's AutoCAD Civil 3D Land Desktop Companion 2009!

Today, finding a "top download" for this software is largely an exercise in digital archiving

While Autodesk does not typically offer Land Desktop Companion 2009 as a standard download anymore, registered educational users often have access to legacy versions of Civil 3D. Sometimes, older installation packages are available within the archived products section.

Check eBay or local surplus stores for the original "Civil 3D Land Desktop Companion" DVD sets. Technical Compatibility Tips

If your actual goal is for educational or legacy project recovery, I can advise:

Guide to AutoCAD Civil 3D Land Desktop Companion 2009 was a bridge release designed to help civil engineering professionals transition from the legacy "Land Desktop" (LDT) environment to the modern, model-based workflows of AutoCAD Civil 3D . It allowed users to maintain their established LDT-style workflows while gradually adopting Civil 3D features within the same ecosystem. Key Features and Purpose