Before you install the game client change your system locale to Simplified PRC Chinese, otherwise error code will appear. To change system locale go to control panel -> Region and Language -> Administrative -> Change system locale -> Chinese (Simplified, PRC).

Install it and let it auto update.
For The English Patch : http://www.bladeandsouldojo.com/topic/16870-english-patch-for-china/

Register Blade and Soul CN