Don't worry, there are so many people trying to download that the update server will regulary have to be restarted when it is congested again. Just try and try and try again. It is a pain but most of us had to do this as well.
It took me 2 full days uploading the C4 client for the pts.
Well ... I was trying to diffuse the situation with a little humor, but I guess it went over your head. :p
The bottom line is that with everyone trying to download/patch C4 right now, it's gonna be just a little bit slooooowwwww! So I'm not really sure what kind of help you'd like atm. If you're getting booted, you just have to stay after it until you ... GIT 'ER DONE!!! :) :)