In order to 1) make sure song files imported properly to RB3 without yet another patch and 2) keep people from downloading the demo and having free DLC automatically popping up in RB3, they kept the export package as something that isn't actually acquired until you get the full version of the game.
DLC on DLCQuickPlay.com. Gamertag is the same as my Forum name. Hit me up if you wanna play!
No, if you download the whole thing as one package through Blitz, there's nowhere to add individual pro guitar upgrades.
Wishlist (possible artists):
[4] The Killers
[1] The Cure
[7] AFI
[3] Sum 41
[11] Linkin Park
[51] Green Day
[9] The Offspring
Or you download all the songs in one package (which, being the core soundtrack of the game, you might not even have to go to the music store to find), with no listings for individual songs, and no potential to confuse Blitz-only players by selling a feature that can only be used in another game.