Considering the car, it's a test prototype of the 2013 Zonda Revolucion. There're some differences between R Evolution and Revolucion. For example, Revolucion features a DRS wing on its flap, while this car still uses the same fixed wing as Zonda R. Also the cockpit of the R Evolution is almost the same as that of Zonda R, while Revolucion obviously has a new digital gauge.
Zonda Revolucion will be added to Project CARS game of the year edition, which doesn't affect this mod. What you will find is just two independent cars in your garage, and you can try either of them.
The new version 2.1 uses a new installation method introduced by SMS since patch v10.0. Patch v10.2 fixed some bugs and everything works fine now (except the less important hud gauge). So no need of Unpacked Boot Files anymore.