Select a mesh, go to the Smooth_mesh_node shelf, and click on the 2nd icon to create a node deformer. In the attribute editor, you can change the "Smooth strength". The 3rd icon allows you to paint areas where you apply smoothing.

Select a mesh click this icon to create the node deformer. Alternatively you can call the mel procedure deformer -type "Smn_smoothMeshDeformer"

After creating the node deformer, select a mesh and click this icon to paint where the deformer is applied. Alternatively you can call the mel procedure ArtPaintAttrTool();

The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin.

You may need to restart the Autodesk product to activate the app/plug-in.

To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8.1/10/11) and uninstall as you would any other application from your system.