At this this moment, Kloxo-MR have 2 version (6.5.0.f and 6.5.1.b).
Steps for release is a (alpha), b (beta), c (candidate to final) and f (final) release.
Using B.1.2 mean installing 6.5.1.b and using B.2 mean installing 6.5.0.f.
Issue for installatron relate to 6.5.1.b issue because 6.5.1.b have many features and change some aspects. Need modified Installatron setting to make compatible with 6.5.1.