Note that at the time of writing (2018-12-11T09:25:00+01:00), 12.0 has <i>not yet been announced</i>. See <a href="https://www.freebsd.org/releases/12.0R/schedule.html" rel="nofollow">https://www.freebsd.org/releases/12.0R/schedule.html</a> . The files available should not be used for production just yet.