We support 4.0.6 - 4.3.4, but the core is 4.0.6. As for main question, it failed to open up expansion2.MPQ meaning that the file is corrupted/edited through another server. Use the Reinstall button on the launcher. Note: If you want to keep you current WoW Install, move the launcher to a new folder and use the reinstall button. All the reinstall button does it make there be a fresh 4.0.6 install in the folder it is placed in.