Did you install the mcg package via the Max Creation Graph > File > Install Max Creation Graph...? I you did that and it won't work, open the mcg file as a zipfile (rename it to .zip or open with 7zip directly) and copy the InsetBySmoothingGroup to the same directory where the InsetBySmoothingGroup.maxtool file is. Then…
By that maxtool file I meant that one at 'C:\Users\Massimo\Autodesk\3ds Max 2016\Max Creation Graph\Tools\Downloads\InsetBySmoothingGroup.maxtool' In the same folder, i.e. 'C:\Users\Massimo\Autodesk\3ds Max 2016\Max Creation Graph\Tools\Downloads' there should be a folder InsetBySmoothingGroup and if it isn't there, you…