I think it is just because it is on the front page of HN. I had more hits today than in the last year! Just wait a couple of days. It's not going anywhere and there hasn't historically been a problem with downloading it.
I think it just has a time-out which is quite short (it's not my server it's mounted on). When the traffic is heavy this is activated before the download completes. I have managed to compress it to about half size now, and I'm uploading that at the moment. It takes about an hour because Rogers pointlessly throttle my upload speed at home.
