Did you forget to make a backup of WoW before upgrading to 3.1? Don't worry! Download and run this batch file from your desktop to solve all your problems.
Backup and Downgrade to 3.1.bat
Here's what it does:
- A console window will appear, showing files being copied from "C:\Program Files\World of Warcraft\" to a folder on your desktop called "Warcraft Backup"
- After all files have been backed up to your desktop, it will delete the patch files in "Warcraft Backup"
- After the batch files in the backup are deleted it will run Repair.exe. At this point you have to click the "Check Files Only" button. It will tell you that Warcraft is seriously damaged, click OK. When the Repair Utility is done running, click OK and you will be at version 3.0.1.
- The Launcher will now start and begin patching, let it patch until you arrive at the desired version.