The game client can be found here in e-Games download section
If you don’t have an account, you have to register an account if you don’t have an account yet.
You have two options, one is to download via torrent and the other is via levelup games FTP.
After installing the game client Cabal, double click the icon/shortcut (either from you desktop and program files). Then you are ready to play, you will be prompted if necessary patches will be downloaded directly to your game client. The game client is about 1.3GB +, so if you have download speed lower than 40kbps you will have to wait for a long time.
Again, if you don’t have an account yet either click the register button from the game client patcher or register here.