when i drag and drop like SimpleThree-1.0.c2addon on construct 2 it just opens it and says failed to open when i need it to install. how do i install behaviors and plugins in construct 2? what file do i gotta put it in? also i need to put three files there SimpleThree-1.0.c2addon , simplethreecamera-1.0.1-stable.c2addon and simplethreewall-1.1-stable.c2addon .