The 7 year old has a Kindle Fire HD that is having charging problems so we are getting a new one. I have to send it back to get a trade-in credit and discount but need to pull 300+ worlds off of it, most of which were purchased through the marketplace. Is there any way to download those to a new device via the account? If not, what do I do? BTW, I'm a computer person, not a Minecraft person who is trying to help out a friend. Is there some way to do this via the account? How many devices can be on the same account?