Huh, didn't know the folder was the license itself. At least I learned something. And you're better at explaining things than me.
Edit: I should note it should be good practice to download the catalogs since if nothing else, you can't even preview performances if you don't have the catalogs they were based off so you can look at something in the field before forking over the money.
Basically the folder contains all the licences (They're 100kb each) which unlocks the items in the catalog for use.
You DO need to go there for 2 reasons:
a) Sometimes the 'bundle packs' don't execute from the catalog correctly (or in my case, one glitched) so you can just go into there and go shopping there instead.
b) If you complete a catalog, the 'catalog complete' item will list there, and you will have to get the licence from there to enable the complete item.
It WILL NOT show up until all the items are bought (Namely, everything except the money and any icons, basically) but you won't get access to the catalog complete item (Although you're entitled to it) until you well, pick up the licence. This is unique to the PS3 version.
The X360's better that way where you don't actually have to pick it up seperately - if you buy everything and trigger it, the catalog will automatically unlock the item.
Neither tell you about that bonus by the way.
