MoP Not Running

So I recently installed MoP, but whenever I try to run it an error message pops up after a couple minutes:


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 in administrator mode, but nothing changed and it still showed the error message.
I also have WotLK installed (maybe that's the reason it won't run?).

Please help!

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"