Start GSP by using Start|Programs|NLR GSP 12|GSP 12 or by double-clicking the GSP icon if you have made a shortcut. At program start-up the GSP the splash screen appears, next the main window appears.
You can also open GSP bij double clicking on a GSP project file from a file explorer program, but beware not to open multiple instances of GSP as you will run into conflicts regarding database access.