Hi @jjay,
It may be related to the version of Civil 3D that you’re using. From Civil 2025.1 onwards, the Civil 3D Toolkit is unsupported. However, there are many more nodes available out-of-the-box (including for pipe networks), so it’s likely that you won’t need to use that package anymore.
For any other gaps that remain, I would recommend looking into The Civil Nodes package from @Anton_Huizinga.