Thansk Tony.
What browser are you using?
In Firefox or Chrome when you click the link it downloads the manual and only shows you a little download icon in the bottom left of the screen. Some people don't realise that they have actually downloaded it and keep pressing the button and thus download about 10 copies of it...
Have a look at your downloads folder on your computer which is normally under your username folder...I have no idea about Macs but it should be the same location I think?