The CreateQuadMesh plug-in has been replaced with the new QuadRemesh command in the Rhino 7 WIP.
This new QuadRemesh command has the ability to create quad dominant meshes from Surfaces, Polysurfaces, Meshes, and even SubD objects. The QuadRemesh command also has the ability to generate quads along an XYZ symmetry axis of the object as well as accept guide curves as influencers for topology layout. QuadRemesh can also generate a SubD object automatically making it easier to convert your polysurface to a SubD object, or create remeshed SubD objects with smooth rounded corners for rendering. If you have used the QuadMesh command in the past you will find this new command to be more accurate and much faster.