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so I've had the game a few months now and all my track downloads work but all the bikes I've downloaded and kits don't even appear in the game I've done it all properly bike in bike files and track in track etc but the only mods working are my tracks and I'm still stuck with the same rubbish standard bike

can any one please help me all my track downloads work but all my rider kit and bbike mods dont work can any body help me please