According to the guide, many users have trouble installing the AddOn.
You could create an auto-extracting RAR, since you can find the Game Path in the Windows Registry (I'm on WinXP) here:
HKEY_LOCAL_MACHINE\SOFTWARE\Blizzard Entertainment\World of Warcraft
under GamePath.
You just should copy the entire text string and cut the last 12 characters from the end, that would leave you on [drive
ath\path\world of warcraft\] and you just need to add [interface\addons\]
hope it's useful =)