Help! game won t run after dowload

Hello ,
I downloaded the MOP expansion for windows and, after it was completed, i tried to run the game as administrator and with the file wow.exe but i get this message :

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

Does anyone had the same problem or know how to fix it ? I would be very grateful : D

follow these steps:
1) Restart your PC ( this is important in your case)
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".