Is there a reason some tracks work and others don't?

First of all, I'm having a blast with this sim, lots of fun. I've installed maybe 10-15 tracks and its easy, just drop the unzipped track into locations and it works right away.
That is except for a few like Bathurst and Autopolis. I unzipped them and did the same as the others tracks, yet for some reason they don't work.
The loading bar goes for a little bit then just stops. At that point the game freezes and I have to shut the program off.
I really want to see Bathurst, especially after I heard its such a great reproduction of the track.
So whats different about these tracks that the usual procedure doesn't work?
 
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