Civil 3D 2019.1 Update: Introduced extended tools for railway design (new subassemblies and ribbon tab) and the ability to publish TIN surfaces for Autodesk Revit.
Operating System: 64-bit Microsoft Windows 10 (version 1607+), 8.1 with Update KB2919355, or 7 SP1.
What’s improved in 2019 (notable for the update)
Interoperability Matrix: Details on backward compatibility; 2019 uses the R2018 .DWG format and is mostly interchangeable with Civil 3D 2018. System requirements for Autodesk Civil 3D 2019
System Requirements: For Windows 64-bit, the minimum requirement is 8 GB RAM (16 GB recommended) and a 1 GB GPU with DirectX 11 support.