Wont update or download!

I bought the full version of this after my son fell in love with the free version. However, I had trouble updating it and getting it to run the latest version. I tried deleting it to re-download, but now it wont download. An awesome app when it worked, but for me now its just a waste of five bucks.

krylon_blue about Elmo Loves ABCs, v3.5.4