Earlier today Capcom reported that a DLC content released for the Xbox 360 version of Super Street Fighter IV was broken.
Gamers were apparently able to pay for the 'Ultra Challengers Pack 1' & 'Ultra Costume Catalog 1' DLC on Xbox Live, but then found they were unable to download it.
The good news is that the problem, as Capcom no confirms, "has been now resolved" and the content is ready for purchase. If you already paid for the content you will be able to download it now at no further cost.
And if you like that, there's plenty more DLC on the way.