Something is interfering with your connection to the server. Are you on wireless? Maybe you should try the update from a wired connection, or at least try resetting your router.
The latest files are uploaded on the manual update, I just need to update the post to reflect it. So you feel free to try grabbing them from there. Even if you get interrupted my server supports resuming your download at least so you won't have to start over every time like you do with the client. ヾ(´･ω･｀)