Cannot start the game.

Every time after clicking the "wow" file to start the game, I receive this pop up.

"Data/enGB/wow-update-enGB-18273.MPQ: World of Warcraft can’t make a required change to an archive file. Be sure you have write permission for the World of Warcraft folder or try running the game in administrator mode. For more information, see: https://battle.net/support/article/6910"

I've tried running it in admin mode, I've disabled my antivirus, and it write permission is enabled. I have no idea what to do next.
Any advice is appreciated.

Thanks!