What I'm trying to achieve is to give the user one single button that says "Download Now", and when they click that, it would determine if they need to download and install the vbRunTime Files as well as the software setup package.

The setup package itself installs a small app that allows them to pick and choose which software components they want to install on their set. This part I have already, I just want to know if they need to download the vbrun60sp5.exe before hand...