EMPHASIS: A principle of design, it refers to a way of combining the art elements to stress the differences between those elements and to create one or more centers of interest in a work of art.
The Catalyst Software Suite already includes compatible GPU driver - - you don't need to download driver separately, and certainly not a beta one. Leave them alone unless an update fixes a problem you're experiencing or offers new features you absolutely must have.
ATI catalyst install manager is part of the Catalyst control center or AMD vision application. This is related to the display driver of your graphics adapter. You want to leave it.