Install

Drag and Drop the SeamsViewer .mzp installer onto your 3ds Max viewport or run it via Menu|MAXScript|Run Script... and click Install.

MacroScript

You can assign Seams Viewer to a Menu Item or a Toolbar Button to open it.

To access it go to Customize->Customize User Interface... in 3ds Max menu bar, and under "Category" select Tools as shown in the image bellow.

Uninstall

You can uninstall Seams Viewer from the "?" button on the tool.