REQUIREMENTS: Max 2016 + SP3 +EXT1/2, Max 2017
Installation: Scripting, Install Max Creation Graph...
Creates various types of arches: Circular, Lancet, Trefoil, Ogee, Reverse Ogee, Inflexed and Horseshoe. Please note that I didn't follow any ancient building codec strictly to the letter...only that the curves are derived from perfect circular segments. Using the Curvature adjustment, you could get other arch types like Parabolic, Elliptical ...etc...