The Windows installer shows a dialog which forces to configure a IP discovery range for "Discovery" daemon. For the reason you can't configure anything else in the installer and most user want provisioning. The installation shouldn't be mixed with this one initial configuration. A initial configuration tutorial how to use OpenNMS should cover this topic and should not be a part of the installer. In a lot of cases you have to go back in the new installed system and you have to delete the unwanted discovery range forced from the installer.