Hddriver News is a free Android app that provides information on your HDDRIVER license and receives push notifications about updates and other news on HDDRIVER. In addition you can send support requests with it.
Hddriver News requires Android 7.0 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 ;-).
News on HDDRIVER can also be obtained via RSS and Atom feeds or by subscribing to the Announcements channel of the HDDRIVER forum.