i have found a way to play pretty much any 70cap server, you need a .bat file, it's VERY easy. once you have this file, put it in your folder where all your .PAK files are (00 - 08) and then you just place it right in there and click it, it will open the command centre which will look scary but it isnt :P you can close it right after, it's just another way to open the DN client, but has a MUCH higher success rate of laucnhing and not, for example, Disconnecting at the login screen. (make sure you get an english patch PAK file in your DN folder too!)
by the way the file is called something like "+=ÊÎÁÃ-¢ã¸_70¦Ô-È" it's WEIRD. a 62kb file which can launch your DN client. i got my one from downloading another server, lu.. something, i forgot the name! hang on i'll look for it..
is where i downloaded the server named "lzgsifu". got the BAT file from in there, just read that forum post.
..i think u can use the official client to play on the other server with the lvl 70 cap and assassin class and i think u jst need the launcher of that PS and u dont need to download another client again...jst my thought 
