Game won't start?

Recently downloaded WoW MoP and upon starting the game i get a small window saying :
"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 tried running it in administrator mode but I still got the same, I tried visiting that link but it says the page does not exist?
Help someone?

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".