How often are new updates released? Is there a road map with approximate dates, or a special date that is desirable for compliance?
I also noticed that youtrack can specify a number of versions that are generally not available for download: for example, now it's 2017.3.1 and 2018. Sometimes they even have tasks. As I understand it, they are too raw to use, because they were not published. The question is, is it possible to somehow join their testing?