Only to be used when the index is down (which so far seems to be every other weekend) :

http://rappelz-forum.gpotato.com/viewtopic.php?f=2&t=1013955

It's been posted by forum mods Kara & Thunder, and it's generally understood that while it's a hack, you're allowed to do it if there's no other way into the game at the time. Otherwise, use the official launcher "to allow the game to update" xD