Unfortunately, I don't use the applications mentioned. I have given instructions to help you with your issue, but I am not in the business. If the official contact option is not working then you can use the Social media to reach them, because the website might have errors.
I have checked their Facebook page and the last activity was 14 hours ago. You can drop them a message this way and they'll respond.
Facebook Contact page: https://www.facebook.com/DaletDigitalMediaSystems