The only other thing I can think to do is to pull up your account on Handang.com on your pc and view your account. I haven't been there in awhile, but I think it keeps a history of what you have purchased/downloaded. You maybe able to download it again to your pc and then put it on your BB via the desktop manager.
or if you have a record of the purchase, you can contact them and tell them that it didn't download. In my experience, my downloads either go into the apps folder or the download folder