Hddriver News is a free Android app that provides information on your HDDRIVER license and receives push messages about updates and other news on HDDRIVER. In addition you can send support requests with it.
Hddriver News requires Android 6.0 or higher and is available on Google Play. Record breaking download figures are rather unlikely ;-).
Ensure that you have not only permitted to receive messages within Hddriver News, but also in the Android notification settings.
The counterpart to Hddriver News is the Hddriver License Manager (German webpage only). This app is not public, of course, and is running on exactly one smartphone: on mine ;-).