Then, maybe your friend didn't download the catalog file? I believe the EX 1 pack belongs in catalog 4.
So, if you don't see a catalog 4 download on their download list, then you'll have to download it on your own.
Just go to the game's shop (easy if you do it through the game's menu) and you'll see a list of catalogs. Each catalog has two versions. One, is for buying the specific DLC (which in your case is the EX 1 Pack). The other is the actual catalog file which you need to download as well. This file is usually big, so you'll know if you're doing it right.