Ok, the downloader for WotLK is here..
http://www.worldofwarcraft.com/downl...yWoW-WotLK.exe
This was released by blizzard to Blizzard freinds and family ONLY.
If I were you, I would definetly not attempt to log into WoW on your real WoW Account. I would only use it for Private Server... Even if you are using a 10 day trial or something, they might IP Ban you. (PS- Just don't wanna be the reason for you being banned)
This works perfectly.