So I'm trying to open up the game and see that patch 5.1.0a is going to download, but then an error pops up saying "The file "C:\Program Files\World of Warcraft\Updates\wow-0-16357-Win-final.MPQ" appears to be corrupt. You may need to download this file again".
The game was working fine yesterday but now all of a sudden this file is corrupt. I've tried restarting my computer but to no avail. Can someone tell me how to download that file again? Because I have no idea how to do that. Or tell me another way to fix the problem.
Try the repair tool, usually fixes problems like this. Or just delete that file and the launcher will re download it. Should be in the "Updates" folder.