You have to Download the full WOTLK installer. Link is in the main guide. I'm not sure if it need to dl the whole client or if it will update your tbc to wotlk, but it's the only way I know.
For the repair.exe that can't connect I think it's because US are under maintenance at this time.
When you log on a realm type "/join english
" to get in touch with the community members.
WoW English/Chinese glossary
(2000+ translated words) found on wow-in-chinese.jfs-web.chEnglish speakers are consolidating on the same realm for Cataclysm check this thread