I designed the install to be done assuming you have multiple C-152 repaints. If you haven't already done it, I suggest you download and install the latest liveries Megapack that can be found at msfsaddons.org. Then add this to the existing C-152 liveries in there. As you'll find, all repaints for any particular plane must all exist inside the same directory structure (i.e. inside ...\Community\liveries-152\...), and you'll have to edit the layout.json file in there, and the aircraft.cfg file in the in the simobjects\airplanes\Asobo_152 directory inside there).