It sounds like you use the same ISX project to create both installs. Make sure that Upgrade code and Product code under General Information are different in ISX projects for each application.

>I was able to do this in VFP6 but not in VFP 9 with installshield
>
>If I have already one software of mine installed in the client computer and try to install a second software of mine, installshield says that the software is already installed and I have to uninstall it first.