Novice here, struggling to find the right resource to figure this out:
I want the user to be able to choose the default install directory by giving them multiple radio buttons to choose from which will select a corresponding install directory.
Don't spin your wheels trying to recreate the wheel.
On the installation designer, in the installshield interface, click on the upper 'Project Assistant' tab. Then click on the bottom 'Installation Interview', "Do you want your users to modify the installation location"?
Set this radio button to true.
However, if you want to limit their ability to install in certain locations, you'll need to set the INSTALLDIR property via a custom dialog. That may get dicey as it may get reset depending on the type of installation as well.
I'd personally save myself a huge headache and default it to a certain location OR allow them to install anywhere.
