Important Things to remember There are Five MaNGOS cores, each designed to support a specific version of WOW.   Core Supporting Client Version GitHub URL MangosZero Vanilla 1.12.1(5875), 1.12.2(6005) & 1.12.3(6141). http://github.com/mangosZero MangosOne The Burning Crusade 2.4.3(8606).