Porsche 356

I have a saved Porsche 356 file (called "356 release.7z") which I believe to be Porsche 356 for GTL but I can't get it appear in car dealer even though it looks a complete car. It seems to be for a SCCA Production class (I can change that to something that will work on my system)

Does anyone know how to get this file working or where I can download a complete easy to install 356 if there is such a thing?
 
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