Guild Wars 2 Doesn't Open Up Post Patch
Gameplay Programmer
It sounds like your Gw2.exe somehow got corrupted while patching. Connectivity loss or a system restart during the patching process could do this.
To resolve this, I would grab a new Gw2.exe from https://account.guildwars2.com/account/download (It’ll download as Gw2Setup.exe)
You can then rename it from “Gw2Setup.exe” to “Gw2.exe” and replace your old one from “D:\game\Guild Wars 2\”
Hope this helps!
-Bill