For those that have downloaded the new maps and get the content damaged error. Do the maintenance thingy on your hdd go to system setting and then memory and then highlight ur hdd and press y then press X-X-LB-RB-X-X. then press yes and this will clear your cache. after you have done that delete the whole halo 2 folder(small price to pay for getting it to work) and then after u have deleted the whole halo 2 folder redownload the maps in this order: killtacular, maptacular, blastacular, bonus map. after doing that back out until it restarts halo 2. if you did it right you will find that when you sign in it doesnt say content error. and when you go to matchmaking you can play. this is exactly what i did i dont know if it will work for anyone else