Installation instructions copy cal3d.dll to you 3ds max installation directory C:\Program Files\Autodesk\3ds Max 2018 copy vrmlexp.dle to the stdplugs subdirectory C:\Program Files\Autodesk\3ds Max 2018\stdplugs (overwrite the original file. Do not just rename the old plugin. If you want to have a backup, move the original vrmlexp.dle to another directory)