MoP Client Not Opening

I just downloaded the MoP Client and when I attempt to open it, it pops up with an error saying this:

"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 downloaded the WOLTK client with the new models beforehand and it works fine. Any suggestions?

1) close your Torrent client and move your WoW folder away from your Torrent's download destination
2) now right click on WoW folder> Properties> remove "read-only"