OneHarryPotter instead of going backwards, I believe that we should go forward. I advise you to update to Flarum stable as soon as possible, because extension authors are normally not going to downgrade their extensions to support Flarum versions before stable. Soon, most extensions will be stable only and you will miss important bug fixes and features in the future
If you are stuck at beta.16 because an extension that you rely on wasn't updated yet, you should contact the extension's author whether or not it can be updated to the stable version