Apr 10, 2020 – Autodesk released the AutoCAD Civil 3D 2018.3.2 Update
The AutoCAD Civil 3D 2018.3.2 Update is available via the Autodesk Desktop Connector app or via download from the Autodesk subscription site.
The Update can be applied to AutoCAD Civil 3D 2018.3 and AutoCAD Civil 3D 2018.3.1.
AutoCAD Civil 3D 2018.3.2 Update
The Update includes the AutoCAD Civil 3D 2018.3.1 Security Fix.
See the ReadMe for install and other specifics.