The other causes are connection related, and will require using a VPN, or caused by something on your computer - the more obvious ones are anti-virus/spyware/ads, firewalls, optimizers, website filters, etc. For more information on what's happening, you can launch GW2 using the -log option. Let it try to download for a few minutes, then exit and post the log. See the wiki on where to find Gw2.log. I am just curious, if you have actually tried to reinstall the game with this information? I have been trying for 4 days now with assistance from support team and I have had no luck. As a matter fact, they said they know its an ongoing issue and have no ETA on a fix. So have you recently, like in the last few days, actually installed the game with no launcher problems?