@gabo12345 please check existing tutorials like https://plutonium.pw/docs/modding/loading-textures/ or on most releases that include the folder where you can paste them.
@guythasawesome need to change where it says zm_tranzit in the GSC to zm_transit. Alternatively, use the new version: https://forum.plutonium.pw/topic/34018/release-zm-select-your-character-options-for-solo-custom-game