Game gives an error

[NuggetNCookie]

Hello everyone the game gives an error

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.

There it is , what should i do please help ?

[Psycho]

Check if this file isn't set to "Read-only"
Run the game as administrator?

Is it a new installation or it was working and now has stopped?

[NuggetNCookie]

i tried but it doesnt work

[NuggetNCookie]

new install

[skullatbash]

a guy with your same problem solved by doing this:
right click on your MoP folder>Properties>disable "read-only"

Remember frostwolf is still 5.4.2, it will be upgraded to 5.4.8 on 26 January so until then you can keep using your 5.4.2 client