Why do you want that particular build? You should use Build 1.6.1.44739 (currently the most up-to-date) available on the Krakatoa downloads page http://www.thinkboxsoftware.com/krakatoa-downloads/. It definitely has support for Max 2012.
FYI, Krakatoa licenses only care about the first two fields of the version number. So that means if you have a Krakatoa 1.6 license file you can use Krakatoa 1.6.1 as well.