Well as some of you may have noticed there are not any repacks or databases that are up to 2.4.
Blizzard also created a new version of the repair executable that recognizes your WoW.exe version.
There are 4 steps to getting your patch back to 2.3.3:
1. Go into the World Of Warcraft program file and delete WoW.exe, not the actuall program file but WoW.exe
2. Run repair, it will automaticly set your game version to 2.0.0
3. Download the file i uploaded on File beam WorldofWarcraft 2.3.0 patch
4. Once u have that done, run launcher.exe untill you have the patch 2.3.3 which should be 2 times !!!BECAREFUL not to redownload 2.4!!!
Edit: Thank you for reposting link