Executable without silent options

I have an old install shield executable that will not work with the silent parameter. I can get the application to install with send-keys but then the application installation would be visible to the user. Is there another way to use send-keys while hiding or minimizing the install screen from the user?

What is the name of the application? Is it an InstallScript, if so which version of InstallScript? Have you tried posting on ITNinja? What command-line arguments are you trying?