To run this G15 plugin it is needed to change some settings at the VLC media player preferences.

Just open the VLC media player preferences (select Tools -> Preferences or press CTRL + P). Make sure to get all (advanced) settings displayed by selecting "All" in the bottom left of this window (see red arrow from first screenshot). Do all settings like shown on both screenshots.

You can copy the "Host Address", like shown on the second screenshot, from here:
127.0.0.1:8082

Screenshot 1 Screenshot 2

If all settings are done, save this settings by clicking on "Save". After the "Preferences" window is closed, you have to restart VLC media player.