- last post: 01.01.0001 12:00 AM PDT
Account management > Memberships > Select the option listed > Change payment options > Add Credit Card > Set it up > Go back to change payment options and select your card > Boot up Halo 2 > Sign onto XBL > Content Download > Select the new maps!
I hope that helps!
[Edited on 06.23.2007 6:20 PM PDT]