I had the same issue. I hit download in background and waited thinking it'd only be a second since it was just another 2.3MB. I was dead wrong. I took forever to download. Back and forth bewteen background downloading and watching it download, it still did not go. However, after a minute of walking around, it did indeed show up as downloading, and finished. I assumed it was because a lot of people were trying to download it at the same time. I hope this is the case for you so you get to enjoy it.