This is a problem that hounds most newbie iPhone and iTouch users and one that has kept me perturbed ever since I used Installous, the cracked AppStore. The problem happens whenever I download a file from FileApe. I kept surfing forum after forum to no avail. Even the suggestions posted by users in the forums did not work for me.
Until one fateful day ;). I happen to come across a post that said there is no problem with Installous. The problem lies with FileApe itself because the session expires too quickly. When I tried it, the guy was right. I had to keep my eye on the timer till the download link appears and I had to tap on it right away in order for the download to work.
Even for just a few seconds, the session will expire right away if you do not tap on the download click when it appears in that instant. The same thing may happen to MediaFire and MegaUpload although the session timeout of FileApe is worse. So you better keep an eye on the timer and the download link. It is only a few seconds anyway.