If the selected video opens but there is no audio, you may have to select an alternative Render option.
From the main menu, follow:
Configuration > Audio / Video > Video Player
In this menu, select an alternative Render option and restart the program. Open your video and check the audio.
If the problem persists, try a different Render option. If you’ve been through the list and there’s still no audio, contact the KlipDraw support team.