this is how i made it work:
I used the crack from skidrow 1.1update PLUS the crackfix from fightclub.
Do not remove the database restrictions files, because the game will crash.
I also cant see the Mud and guts car pack or Power and glory car pack, though i just started playing the game. it may unlock further in the game, i hope.
the other dlcs are unlocked in the game extras -> available add-ons menu.
hope this helped someone.
