Firstly, I would recommend reinstalling the product. In many cases, you can simply reinstall the application and everything will be back to normal. However, if this doesn't work properly, then you can use the available email as instructed on the official website to contact the developers. They should provide you with another version or give you additional instructions about this.
- Contact email: firstname.lastname@example.org
Also, check that your firewall allows GfK Internet-Monitor to connect to the Internet.