I purchased a pack and it won't let me play it and crashes every time I try.I purc

I am playing on Minecraft Pocket Edition. I purchased the "Jungle Zoo" pack from creator pixelheads and downloaded the pack and created the world. I tried to go to the world and it would stay on the loading page then crash   After a few tries I just gave up. I would try every day and waited for the next update. I updated, and still it would crash. I then deleted all of my other worlds to try and get the world to work. This did not work either. I then deleted the whole game, re-downloaded it, signed in, and re-downloaded the world. Still it would not work. Please fix this bug, or give me some advice. Thanks!