There's only a link to the developers website. But on this website isn't a possibility to download the Groeneveld Twin PC-GINA program. Thanks for help.
After some checking I concluded that PC Gina is an application unavailable for public downloading. Although their website mention it and various documents are provided, you can't actually download the program.
The remaining solution is to get in touch with the developer. They should provide all the available options regarding the acquisition of Twin PC-GINA: http://www.groeneveld-group.com/index.php?id=82
