Unable to download the iTunes purchase extra material

I recently purchased from iTunes the new release of concert for Bangladesh where they specify that the purchase will give you extra material. The rest of the album downloaded just fine but the special LP is not downloading with the blurb “concert ….iTunes could not be used because the original file could not be

found” it then asks if you would like to find it and on pressing yes it takes you to your list of your applications. What does all this mean and which application can I choose to get the material. Thanks in advance