I don't know, I even logged out, cleared my cache, and tried it, and they worked. If anyone else can't get to them, please let me know so we can figure out whether the problem is on Mediafire's end or Heget's end.

EDIT: I've submitted a ticket, because Mediafire won't know there's a problem if nobody tells them. If they don't get back to me by this time tomorrow, I'll re-upload the files and edit the post.