Modern computer technology sometimes prevents certain application from working. That happened to the Arkance Systems Node Library for Civil 3D Dynamo too. Since Civil 3D 2025 and Dynamo 3.2, this package does not work anymore, and is no longer maintained.

But there is great news! A new package was born which does work in Civil 3D 2025 and Dynamo 3.2! That new package is named:

If you are working with Civil 3D 2024 or an earlier release, you can still use the Arkance Systems Node Library. Once you made the move to Civil 3D 2025 or higher, you need to update your graphs to The Civil Nodes.