So for the new EE version, all you have to do is connect to the server and it should automatically download everything you need.
As for the password, you can look at your old approved characters and you should find the password.
Though if you are able to log in you might not be able to access your characters because the characters are linked to your old cdkey. If possible to find your old cdkey then replace the new cdkey with the old cdkey in your nwn.ini file (I think that's what it's called). If not then you might have to wait until one of the admins connect your old characters to your new cd key
Hope that helps!