Install

1. Drag the "polysmoother_installer.mzp" file onto the 3ds Max viewport, or run it from Menu -> MAXScript -> Run Script...
2. In the installer window click Install (or Update if a previous version is present).
3. After installation completes, restart 3ds Max.
4. After restarting, open Menu -> Customize -> Customize User Interface...
5. In the dialog, set Category to Tools and find PolySmoother in the Action list.
6. Drag the PolySmoother action to a toolbar of your choice.

Actions

You can assign actions to "Hotkeys" or "Menus". Go to Menu->Customize->Customize User Interface... and select Editable Poly from the Group dropdown and then "PolyTools3D - PolySmoother" in the Category as shown in the image bellow.

Since 3ds Max 2020 there is a separated UI for setting up the HotKeys. You will find the "PolyTools3D - PolySmoother" in the Category column of the Editable Poly Group.

Important: To avoid any issues while installing the tool, make sure you are running 3ds Max as Administrator. If you have an Active Antivirus software, you may want to either temporary disable it or whitelist PolySmoother.

Uninstall

To uninstall PolySmoother select "Uninstall PolySmoother" from the PolySmoother Help menu.