The GTA LIberty City mod is for GTA Vice City and not San Andreas, you can't also install one mod in top of the other. Please reinstall GTA San Andreas and install the SA:LC mod, which is for San Andreas.
Well, the only problem is that we can't stop piracy. Even if the Police knocks a pirate's door, they don't stop, they just "fell in love" for the Internet in the 90's and started to do shit.