I am also stuck at 1 file remaining, but the game is playable for me.
I have tried adding the following to my shortcut:
-assetsrv 62.154.232.187:80
-assetsrv 151.249.90.138:80
-assetsrv 194.25.94.170:80
-assetsrv 174.35.71.9:80
-assetsrv 151.249.90.199:80
-assetsrv 93.188.135.37:80
-assetsrv 62.154.232.194:80
some of which I could not ping, and so unsurprisingly resulted in Error connecting, retrying….
These would be using Mediacom from Cedar Rapids, IA, USA.
I also tried running:
netsh winsock reset
netsh int ip reset
shutdown /r /t 0
Then I started GW2 with -assetsrv 151.249.90.138:80 still set.
After that I started a 7 day free trial (as of today) for a VPN and set the location to Frankfurt, Germany and tried:
no specified -assetsrv
-assetsrv 151.249.90.138:80
I then tried using:
-repair
None of these solved my issue.
I then tried setting my language to German (Deutsch), and downloaded the files, but ran into the same 1 file remaining issue.