I don't have an iPad, but perhaps you could download it on your laptop in a Dropbox folder (or a similar service), and then open it in the Dropbox app using something like VLC?
That's how I use my Android tablet, at least.
That's how I use my Android tablet, at least.
I'd bet that it's been updated to integrate better, though. Could be a pretty good solution if you're used to using Dropbox.