Bueno, este es otro cargador de Mods llamado Minecraft Forge API. Descargan Minecraft Forge 1.5.2. Buscan en el buscador %appdata% y abren la carpeta Roaming, luego abren el archivo .minecraft/bin/minecraft.jar. Pegan archivos de Minecraft Forge dentro de “minecraft.jar”. Y luego borran la carpeta META-INF.
Link:    http://adf.ly/673885/http://files.minecraftforge.net/minecraftforge/minecraftforge-universal-1.5.2-7.8.0.688.zip

Well, this one is another loader of Mods called Minecraft Forge API. You download Minecraft Forge 1.5.2. Then search for %appdata %  in the searcher and open the folder Roaming, then open the file .minecraft/bin/minecraft.jar. You must copy and paste Minecraft Forge's files inside "minecraft.jar". And then erase the folder META-INF.
Link:    http://adf.ly/673885/http://files.minecraftforge.net/minecraftforge/minecraftforge-universal-1.5.2-7.8.0.688.zip