I'm a little confused. If you are talking about the app Requiem (a game on the App Store), it says only that you have to have iOS 4.0 or higher. So, if Requiem is not working on your iPad running 4.3.5, have you contacted the developer to see if he or she can assist you in making it work? At the least, I am sure developers appreciate knowing that their games are working on certain versions of the iPad. Or, you could ask for a refund if you don't want to go that route.