Is there any way to let apple know shellshock patch download is broken?
That DL article works for me on 10.10 - Do you have another browser or computer to do the download? If not, you might have to go to a friend's or Apple Store and get help directly from the genius bar. 

There is no charge for in-store help and you probably can resolve this with a USB stick and a different browser/OS combination.

Also, I've put a link to the dmg on dropbox, but you really, really shouldn't trust internet downloads unless you can checksum the file and are confident it's as safe as what you'd get from Apple directly.