Thanks for the reply. I put the code in as soon as I started the game and it accepted it, but it still tells me I need to be at Knight's level or something for about 2/3rds of the encounters. I can download the scenes individually, but that isn't the same as in the context of the game.
I have the same problem. I have been liking the game so I bought the code, but in my save file the galleries and scenes are still locked after entering the code. Playing on mac.
[Edit: I found you have to 'start' a new game. You can then select the chapter and fast forward to where you were before. It's a bit difficult but it works.