except for reinstall the whole game, anyone has a better solution to switch languages between Chinese and English???
I remember trying to do that for a French install. Sadly, there is no other way than a fresh install. These days and with the digital download option, it is so fast to do. I usually suggest manually downloading the patch, too. Sometimes, when it patches while connecting to the server(s), it may not work. Not sure why. Manual patching works every time.
Downloads – Blizzard Entertainment
Patching Classic Games - Blizzard Support