Dynamo Sandbox without Revit - current status?

I’m attempting to run Dynamo Sandbox (Dynamo Core 2.1) without Revit or any other Autodesk product installed - which apparently require the full ‘AutodeskShapeManager geometry kernel (LibG)’. I assumed that the Sandbox would work ‘standalone’ and that its ‘libg’ directories would provide access to all basic non-Revit graphic functionality.

A test using ‘PointByCoordinates gives :-

*Warning: Point.ByCoordinates operation failed. *
Could not load file or assembly ‘file:///C:\Program Files\Autodesk\DynamoCoreRuntime2.1.0\DynamoCoreRuntime2.1.0\LibG.ProtoInterface.dll’ or one of its dependencies. The system cannot find the file specified.

If I move the ‘LibG.ProtoInterface.dll directly into the DynamoCoreRuntime2.1.0 directory the warning changes to :-

*Warning: Point.ByCoordinates operation failed. *
Method ‘Approximate’ in type ‘Autodesk.LibG.CurveHost’ from assembly ‘LibG.ProtoInterface, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’ does not have an implementation.

Hence my question regarding additional dll’s.