To install the .NET wrapper please add the DLL WPTDynamic.DLL to the library/toolbox.
In VisualStudio you can also use drag&drop to add the assemblies to the toolbox.
The assembly WPTDynInt.DLL was compiled with .NET Framework 1.1, WPTDynInt2.DLL was compiled with the .NET Framework 2.
The registered version includes the source code of the interface DLLs - written in C#. So it is possible for you to recompile the assemblies.