I purchased the City Mashup pack yesterday on my daughters iPad.  The pack never downloads.  The iPad screen says "Purchase in progress, this shouldn't take long".  But it never downloads.  I have tried restarting the iPad and looked for updates.  When I go back into Minecraft and select Purchase City Mashup pack again, it says the item has already been purchased and it will download for free, but it never downloads.  Please advise me on how to fix this issue.  Thank you very much.