Using Installshield Express 3.5 (that comes with VFP 8) for VFP 8 applications.

I got a simple installation to work, it installs all files on every install. This includes overwriting existing data files. Also I had to hard code the drive and destination folder to get it to work.

My questions:

1. how do I install only install new versions of the program. that is do not change the data files.

2. for this applications I could hard code the destination folder. For other applications this will not work since application lives on a server and I have no way of knowing how it is mapped. How do I allow user to select the drive letter, but not the folder name which I want to be hard coded into the install?