For me, first it stuck at 20% - I've closed the client, reopen, it jump to 40% and next stuck, that was the moment I tho that program wont work more, always stuck at 40% and gives me error.
Now, this start working ( o.O ), I tried to log into EUNE, now it says "Dany klucz nie był obecny w słowniku." (I have polish OS, so that means "This key hasnt been in dictionary or The given key was not present in the dictionary" [whatever it means]
edit ; I tried euw and na, and i've got this : Unable to get Auth Key