After Installing the .ZIP folder your going to want to extract the files within into the MelonLoader Mod folder created by the MelonLoader autosetup.
From here your going to want to load into Signalis.

Once loaded into a scene where Elster physically exists, one can hit either the 
F1 Key->First Person Camera
F2 Key->3rd Person Over the Shoulder Camera
+ Key-> DMC/Drone Perspective Camera

Before using please enable Tank Mode in settings and Simple Enemy Rendering, these will make sure that controls are correct and that enemies actually appear.