I am trying to download all my apps that I have on my ipod touch onto my new computer. I cant copy my applications folder from my old computer because my computer crashed. When a download a free app I already have it tells me "you have already purchase this item. To download it again for free click okay." But when i try to download an app I paid for it tells me if i am sure that i want to buy the app and that my account is going to be debited. How can I re download my paid apps for free.