To keep the download size as small as possible, DrawMerge doesn't include all of the runtime files needed by Visual Basic (DrawMerge is a VB5 app).
Most users will have a VB5 program of one sort or another already installed on their computers, and DrawMerge will have everything it needs to achieve true happiness. To learn more and to find out whether you have the needed files, please see Is there a Demo?
If you have any problems running DrawMerge after following the instructions there, please email us at steve@rdpslides.com We'll work out a way to get you up and running promptly.