One thing that is left out of the notes is that for users on Windows Vista & 7 the "program files" folder requires admin access to install to and use - and for some users that will be a problem,. On top of that the default WoW install path
on those operating systems is actually in the C:\Users\Public\Games\World of Warcraft
directory, NOT in program files.
So in short, the way to make this thing install correctly is when you are at the option to choose if you install the entire program to hard drive or not, choose to install the whole thing and then at the bottem right hand corner hit "browse" and
navigate to you WoW folder ... once there "create new folder" and name it something like "addon studio" and then install to there.