I myself are still having Caterham and Marussia in the game. However I replaced the Marussia with my Tyrrell PIAA and the Caterham first with my Arrows and now with Prost GP.
I think more people are having Caterham in the game. So if they like they can replace Caterham with Prost GP (based on Torro Rosso.
NOTHING CHANGED IN THE SKIN. HOW TO INSTALL READ THE INCLUDED README-FILE.
IF YOU ONLY WANT TO REPLACE TORRO ROSSO ... unpack and rename:
cars/tr2/livery_main/texures_high/tr2_gen_high_main .......and copy into cars folder.
cars/tr2/livery_main/texures_low/tr2_gen_low_main .....and copy into cars folder.
No further need to copy the other files into the game, only do above