Originally Posted by
Gulkeeva
Depending on if your using mac/windows this could be different! I had a similar issue... redownloading wotlk
Go to your cata folder and remove every *patch*.mpq file
then look for all your patch files download, and remove them also (the ones that have alot numbers with an exe on the end), run repair.exe (if cata has one, it should)
restart patcher, and don't sit and hit "next" as soon as the patch finishes, sometimes when it finishes it "hangs" for a bit, and you have to wait for the machine to stop grinding on whatever its doing with the patch (I waited about 15min just to be sure before I force close it if it didn't seem to finish)
very last resort is to remove it all and redownload it all (yes all 13gb+) as something may have been severely fucked up