Note: Before you install patch, please make sure that you have completely exited the client, or you will fail to update the client successfully.

Download link:
Patch 5058: Link1 Link2 Link3 Link4 Link5 Link6
Patch 5056-5058: Link1 Link2 Link3 Link4 Link5 Link6

Highlight of Patch 5058

All players on the Mars server, and all accounts contained within will be moved to the Venus server on Sep 1st 2008. It will begin at 18:00 PDT after server maintenance and last 5 or 6 hours or so.

The Venus server will be awarded with 7 days' double experience after mergence from Sep 1st to Sep 7th.

How to get Double EXP?
Find OldGeneralYang (Twin City, 441,377) and talk to him, he will give you one hour of Double Exp time for free! You can get more free Double Exp time as often as you like during this event!

Check here for details