Same problem for me, I received an email saying that the UDID was checked and I could download the app....
I try to download it, the iTunes Store opens and starts downloading and the app stops downloading and remains with the cloud icon on the right side.
However, I try to open it by clicking on it and it says: "Failed to install" Try again later...
I've been waiting for days, I've read several articles in the open forum, I too have a topic, many have this problem and no one helps us, they tell me to wait, I wait but it still doesn't work, this behavior is not correct.
There seems to be no solution, and it was just a waste of money.