The Blastacular Map Pack has been updated to fix bugs and superjumps before eing deployed to Matchmaking. The two new maps for Halo 2, Desolation and Tombstone, have both been replaced with updated versions, with the geometry fixes added. You will need these to use them in Matchmaking. More new on that later this week.
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I fixed this problem for my account a few minutes ago. I changed two things to get a successful download on my 360 so either one of these might be the solution. 1.- I had multiple credit cards on my 360 (all but 1 were expired), i did have the working one selected but i still couldn't download. I went to www.xbox.com and adjusted my billing options so i only had the 1 working card on my 360. I selected the expired credit cards and selected the "transfer all purchased to card xxx". After i was done all but one of the cards had "(removed)" next to them. 2.-After which, I erased all halo 2 files on my xbox 360. #1 is probably the solution, but if it doesn't work try #2....hope this helps