Just Downloaded Gay Tony...Where Is It?

[Izanagi]

So I just downloaded the Ballad of Gay Tony and I can't find it on my NXE. The screen said it was complete but that I would also need the disc to play...Is this true? do I need to buy GTA IV for 360 to play Gay Tony or the Disc Based version for 50 bucks? I wanted just Gay TONY but am I shit out of luck and do I need to purchase the 360 version of GTA IV??