Recommended and with JRE is the same. We have dropped the “recommended” label on installers including JRE (see Openfire, it is now recommended to get version without Java included). Just because our included version is older than the latest and with Oracle’s complicated licensing we might stop bundling Java in the future for all products, so users/admins would have to install Java themselves.
Btw, give a try to this build. It might work better with certificates.