Brother please make it free because many people just are better off spending 2 euros on other things than some paid mods which they probably use one or two times.
Have you looked at the bottom of the car list, it may be listed as props (like the Agent simplified traffic cars)
Have you extracted the zip file before dropping it to the mod folder? It has 2 seperate mods, mobile and stationary versions as zip files so it doesn't work if you don't unpack it. If you have, please try with other mods disabled. --- Post updated --- Alternatively you can drop the 2 zip files to mods folder after unpacking the file instead.