How can I run my newly downloaded MoP 5.4.8

[Richel]

I'm having a problem I already try run as admin but it say "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" can anyone help me so I can play it now.. THANKS!

[Zelta]