All of the assets in the toolkit are compiled as C#.NET libraries that have no external dependencies to a server or to an application.
This makes the installation process quite trivial.
Start by downloading a zip file of the compiled libraries that correspond to the release you want to use:
Alternatively, you can use Visual Studio or another program to compile the libraries directly from the source code in the repository.
After unzipping, import the libraries to the game engine that you are using. In the case of Unity, this is done by simply copying the DLLs to somewhere inside the Assets folder of your game project.
Developed @ GAIPS INESC-ID, University of Lisbon