Downgrade from 3.x.x to 2.4.3

1.Download this file:Click Here [Wich is Wow.exe]
2.Go to your world of warcraft folder, such as:
C:/Progam Files/World of warcraft/

3. When the downloading is done, delete the current Wow.exe you got and drag the new one into WoW Directory

...

Lets say you got repair 3.0.0

Your going to need Repair 2.4.3

The 2.4.3 Repair package with US And EU
Download:CliCk Here
When the downloading is done, move the Repair.exe to WoW Directory

Click reset and check files. NOTE: IF YOUR USING VISTA, BE SURE TO RUN IT AS ADMINISTRATOR

4. When the repair is done you can go to realmlist.wtf

set realmlist blinkwow.sytes.net

Remove: set patchlist eu or us.logon.worldofwarcraft.com (cause it will make you patch up)

And your done