I have an iPad app called "Puzzle Quest HD". It appears for some reason that it's not available in the iTunes store anymore (at least in this country). I was under the impression at if I purchased an app, it would always be available to me even if it gets removed. It's on my iPad, but when I "transfer purchases from my iPad" using iTunes, it doesn't move that one app. My question is why don't I have access to this app so I can put it on my wife's iPad as well?