Lion having download problems

I recently bought Lion (yesterday) and have been having trouble downloading it ever since.

I wasn't sure if having the screensaver come up after about 15 minutes of inactivity would affect the download or not, so I paused it, left for sports practice (a couple of hours), came back, and clicked resume. It wouldn't continue downloading. So, I simply "bought" it again for free since I had already purchased it, and let it begin downloading again. I needed to go to bed because it was pretty late, so I again paused it, closed my computer, and when I woke up I was greeted with the same result after trying to resume it. I tried doing it again but this time I left it paused for only about 10 mins and still the same result. So I tried setting my computer so that it wouldn't go to sleep or start up the screensaver, and left for another practice (again, a couple of hours) hoping that it would just continue downlaoding. When I got back, the screensaver was up, I was logged out, and it again wouldn't download. I do not have time to devote 10+ hours straight to sitting on my computer and making sure it gets downloaded, I need to be able to space it out, so I really don't know what to do about this:(