Can you download all 9 Halo 2 maps (Elongation, Terminal, Backwash, Gemini, Relic,etc.) onto a 360?

I'm going to buy Halo 2 just for fun, and wanted to know if there's a way I could still download the 9 maps over xbox live to an XBOX 360, or do I have to buy the disk with them on it (not just the blastacular 2, but all 9) thx