Help me please :')

Hello and sorry by advance for my bad english because i'm french !
As you probably know , i would like to join this private server !
I downloaded the utorrent file " Wrath of the lich king 3.3.5a "
But after the download , i just open the file and a window appears and say "Impossible to open the application World of Warcraft" . I tried to force check the files , i downloaded it 3 times ! But it still saying " Impossible to open (....) wow"
I wish you could help me because this server looks really good !
Thanks, :)

PS: My Mac version is 10.10.5

http://forum.warmane.com/showthread....-os-x-yosemite