This specific version was a milestone for users because it resolved several "ghost in the machine" issues found in earlier 2014 builds:
Version 14.12 optimized the memory overhead, allowing it to process archives 30% faster than the 14.11 release. A_Spell_for_All_14.12.zip
A set of rules that tell the engine how to interpret specific engineering metadata (like material density or stress tolerances). This specific version was a milestone for users