Nov 16, 2018 – Autodesk released the Civil 3D Object Enabler 2019.1 Update
The Civil 3D Object Enabler 2019.1 Update is currently only available from the AKN site. As of this post it does not appear on the Civil 3D 2019 downloads page.
Civil 3D Object Enabler 2019.1
This Civil 3D Object Enabler 2019.1 Update was initially released on Oct 24, 2018 according to the AKN download page.
The Civil 3D Batch Save Utility may require this Object Enabler update to process drawing files with the Civil 3D 2019.1 Update installed.
Here is the link to the Civil 3D Object Enabler 2019.1 download.