Lux, I went ahead and reinstalled Regularize again.  In the Customize menu, I added the script to my Quad panel, as you have.  However, after saving my new UI with it in my quad menu, I right-click in the viewport to bring up my quads, and Regularize isn't in there.  I know I had this thing working before, so I must be missing a step here?  Any suggestions?

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.