Disappointed about Videos

I love a Beth Moore bible study and was really excited that this format on iPad was available. I have explored some of it and find it easy to use and enjoyable. The only thing I was really disappointed with is that I cannot seem to purchase the videos. The first two free ones download and play beautifully but when I choose the additional ones it asks me if I would like to buy it but when I choose that nothing happens. No download. Would really appreciate it if someone could come up with a fix for this.

Jodee9999 about James: Mercy Triumphs by Beth Moore