Your link is not direct, try this one https://docs.google.com/uc?export=download&confirm=pyPr&id=0BxIItmVvlT5DeDFXci1PekI1S1E, also you need to change Modpack_1.6.4.jar to the correct forge version renamed to modpack.jar http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.6.4-9.11.1.965/forge-1.6.4-9.11.1.965-universal.jar