Can't Install

Hey, so I downloaded the files, and I try to open (I installed it to my D: drive) D:\Mists of Pandaria 5.4.8\wow.exe, but I get this message (running as normal or administrator, still get it either way)
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

Right click the world of warcraft folder, uncheck the "Read-Only" box.

Whoot, it worked, thanks a lot mate