"You've already purchased this but it hasn't been downloaded. To download it, go to Purchases and tap Redownload." I bought a book earlier but the download stopped a fifth of the way through. When I went back to the store and clicked purchase again I got that message. So I went to Purchases and tapped on Redownload. I got the same message again! I just know it's because there's a partially downloaded file somewhere and that if I deleted that this would probably be fixed but obviously I can't do that yet. Has anyone run into this problem and know of a solution besides rebooted and resyncing, which didn't work?