Update error and can't proceed.

#1 - April 22, 2012, 12:41 a.m.
Blizzard Post

I was looking around in-game options and found language selections. I changed it to Southeast asia, and the game client restarted to update. However, when I start launcher, it gives message "An unexpected error occurred while updating required files. Please try again."
I can't get in because of that, and I want to know how to reset settings. I can't find any ini or anything.
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Quality Assurance
#2 - April 23, 2012, 6:18 p.m.
Blizzard Post
User Interface
There is currently a Locale Selector in the Options --> Account menu. DO NOT USE THIS SELECTOR! This was not supposed to make it into our Beta build.

Workaround - If your game gets messed up because you used this feature, delete your Battle.net folder from your main harddrive/My Computer/ProgramData folder.