Step #1: Buy the taiwanese game on this website for around 75$, it's the first thing for sale at the top.
Step #2: Once your payment is sent and you went through all the steps, you'll receive your CD-Key on the website, it will be a picture, write it down.
Step #3: Create bnet account on your region's battle.net
Step #4: Log in to your account on battle.net and click on "account" in the top menu.
Step #5: Click "games & codes" in the dropdown menu then click "add or upgrade a game".
Step #6: Enter your game key, the one you received from offgamers when you bought the game.
You're done, your game is activated, you now either need the taiwanese client or the relocalization mod.
Good Luck. It works for me.
Edit: If your downloading the client, turn OFF peer 2 peer downloading in the options, holy crap took me from about 80k down and it SUCKING about 50K up making even internet browsing unusable to now downloading at 225-250k and not uploading anything since it isn't talking to the peers anymore. Working WAY better now.