I have a stair that splits and goes left and right.  I have been spending a good part of the day trying to find this.  I tried to place Stair Maker Add-On in the Add Ons folder and now I am having difficulty trying to unzip it.  Why aren't these programs just made available in the regular program?  I am no computer wiz, I just want to be an Architect and use what is supposed to be a easy to use program ( an it is).  See Page 246 in Reference Guide A11.