@urszula What about a forum topic called “Mudita Software Releases” for announcing new software releases about Center, Pure and Harmony?
Limit the ability for others to post to ensure that topic remains dedicated to its purpose. People who are interested would then subscribe this topic by having the “Watching” option set for it. They will get informed by email then if there is a new post. If there is no interest in that topic anymore the option “Muted” can be set. Stick this topic on top of the Mudita Forum so people who are new here would see it right away.
Here a screenshot showing what is meant by “Watching” and “Muted” on how manage ones subscription for a forum topic:
The uncertain point is if you have the ability to control who can post for such topic. I do not know if such option exists for as Community Manager.