You could choose the method of either BT or HTTP.HTTP is recommended;
    If you are using Windows Vista, please do not install the game in Disk C;

   This is the link to the HTTP download. If you have a slow internet connection, we suggest     using HTTP Software to download the file.

Http Software	Game Client
FlashGet FlashGet Guide	[US]Download Client  [US]Download Client  [US]Download Client  [US]Download Client

   This is the link to the Client Seed File download. We suggest using BT software to download     the file.

BT Software	Seed File
uTorrent uTorrent Guide	Download Download

   This is the link to the Patch download. The patch is for version v1.37 or above upgraded to     version v1.37.

For updating from any version to the newest

Patch Download Link 1  Patch Download Link 2  Patch Download Link 3  Patch Download Link 4  Patch Download Link 5

The Latest Patch (From Mar 15th to Apr 24th)

Patch Link 1