The mdk (renamed from src zip, because it no longer contained the forge source) is a zip containing a template mod, gradle buildscript, and instructions on setting up your ide, you c an download it here: <a href="http:&#x2F;&#x2F;files.minecraftforge.net&#x2F;" rel="nofollow">http:&#x2F;&#x2F;files.minecraftforge.net&#x2F;</a>