yesterday I download the MOP, and there was a problem when starting the game. it says:
(Data\enGB\locale-enGB.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 looked a little bit over the internet, and I found that it helped some people when they had this problem to unlock "read only" I did it, but I still have a problem.
follow these steps:
1) Restart your PC
2) close your Torrent client and move your WoW folder away from your Torrent's download destination
3) now right click on WoW folder> Properties> remove "read-only".