The most recent beta is always available for anyone to download under the Announcements section of the Beta Testing forum here. I believe the most recent is Release Candidate 10 = v. 2.9.9.10. You’ll get the best answers by posting questions about features in that forum. Here is the direct link to the post with the latest beta release (ignore the 2017 date; that’s when the post was first created, not the date of the latest release).