Cannot see tyres

[Ruoppolo]

Hi all, i'm an " old " member but with a " new " pc. I've just downloaded and installed the game and downloaded the superbike legends pack. I've unpacked in the game directory the two folders " BIKES " TYRES " in the gpbikes folder but when i start the game i cannot see the tyres on the added superbikes. Can anyone tell me why ? Sorry i'm no so good with mods ^^ . Stay safe