This is the repository for the updated versions of the SMC addon for Blender 2.79 and 2.81, although it was "ported" to the new versions by me (@SalatielSauer), the author of the addon is Eric Depta, more info: http://wrack.github.io/sauerbraten/marchingcubes.html
Version 2.79b solves the error “ValueError: too many values to unpack (expected 3)”