jasonrdavisFirst thing to find out is how you would uninstall it manually with no user interaction. I tell my team this all the time when they want to use Kaseya to do something like this - Kaseya can only script for what already exists.
So start googling for a command line uninstall, and test it out. Once you find a way to just run a simple command like: msiexec /u foxit.exe (I'm making that up) that will remove it, you can use Kaseya to push that command to your machines.
If there is no easy command line way to do it, you need to find and document the steps to manually remove it (i.e. what reg keys to remove, what directories to delete). Then we can script it.
Hope that gets you started.