installation problems of mods at rFactor 1,250

When installing downloaded circuits, some give an error code, error opening mas file. And I miss the sound with the endurance claccic GT1 and with the LMP 900. does anyone know what the problem is and how to fix it
 
i was having this issue with vehicles as well that i was installing, and it seemed to have to do with the folder structuring. any track or vehicle that was giving me the mas error i took out of whatever folder it was in(usually tying it to a particular series), and moved it up a level, usually putting the folder straight into vehicles, or locations.
 
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