Because there is no official PC executable, modding LCS requires a layered approach. We will assume you are using the (the most stable for modding).
The modding community has done something Rockstar hasn't: given LCS a second life. However, a ground-up "Remastered" mod is currently in development. gta liberty city stories graphics mod pc
If you have the game, take the hour to install the texture packs and the shader presets. You’ll find that the city you thought you knew has secrets hiding in its newly sharpened pixels, waiting for you to discover them all over again. Because there is no official PC executable, modding