Rain Pro Bug

Just wanted you to know that your Sleepmaker Rain Pro refuses to download on my iPhone 4s. I saw that most of your Sleepmaker apps were free for Mothers Day, so I downloaded all that I could, except Rain Pro wont download from the app store, and not sure if it has anything to do with the screenshots never loading. I would love to have Rain Pro to add to my collection. Thanks in advance.

Bebop363829 about Sleepmaker Waves Pro, v2.1.6