You should first have installed the appropriate trial version of Scrplus.
Use the secure form or the insecure to make the purchase on-line.
Finally released the long-awaited Scrplus4 for BCB4. This is WAY easy to use. Includes a wizard for a 3d accelerated OpenGL saver, and for a DirectDraw saver. Lots of fun example saver source code — including Dragon Cutlets, a winner in the 1999 3dfiles.net screen saver contest. Extensive help in HTML format.