Hey! I just started playing BnS a few days ago, and I had this same problem when I was trying to download/install the game.
I was able to get it up and running by closing and relaunching the downloader everytime it bombs out like it has in your screenshot.
I know it sounds tedious...I'd get 10-20% downloaded each time though. It looks like it starts the download over from the beginning, but it really doesn't. It should quickly catch back up to where it was when it stopped previously, and then you should get more progress out of it before it bombs out again.
Sorry it isn't the best solution, but it worked for me. I'm happy to say that since installing the game, I've had no other issues, and I've been able to download/install patches perfectly fine since then.
Good luck!