Sometimes, the "Edge continuity" tool will not work correctly when you modify one of the surfaces whose edge is included in the analysis. Also, if you already have two edges paired together for an edge analysis, the "Edge continuity" tool will not let you assign another edge to one of the two used edges. With other words, if edge A is long and touches two shorter edges B and C, the tool can't simultaneously pair edge A to edge B and edge A to edge C. You are allowed to pair only edge A to edge B or edge A to edge C, but not both.
Sure, you can download this particular display mode (and many others) from the first post in the following thread. Simply navigate to the bottom of the first post and download "Alias 4.ini" and its corresponding environment map named "Alias 4.jpg": discourse.mcneel.com/t/share-your-custom-viewport-modes-here/151321
