Can't start my game

Hey guys, im fairly new to WoW and stuff, so please keep that in mind. Ok, so, i've downloaded the bit torrent from your Download tab, and eventually when everything got downloaded, i tried to start the game. then i got the following 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 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

Ok, so, first off, i tried running the game in administrator mode, it did NOT help. I also tried deactivating my antivirus temporarily, that also did nothing. Any ideas what i should do so i fix this and finally get to play the game?

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