i to am also having problems with this and searching for more than 5 hours to try to fix this problem i still have not seem to find anything but it does seem that alot of people are having this problem and hopefully the devs will look into this problem and check it out because it seems like alot of people cannot install there game nor play it.
my game loads to 10% then goes to 0kb/s and now that i tried to fix this problem i cant even load up the gw2 launcher it loads then crashes to 0kb/s after 10 seconds.