How to fix Game patch error!

1. If you have game patch error, plz delete everything in your folder that is named undamed then get a new copy of the launcher from http://www.undamed-wow.com/down/Undamed-Launcher.exe. Try that out first and if that doesnt work, try clicking delete patch on the undamed launcher then click Cataclysm button.
2. If you download after finish download say (YOU NEED TO DOWNLOAD THE PATCH), please try clicking delete patch on the undamed launcher then click Cataclysm button.