The extension is compatible with SketchUp 8, SketchUp 2013, SketchUp 2014, SketchUp 2015, SketchUp 2016 and SketchUp 2017.
In order to apply it, just press a single button to begin the tool. Choose or deselect the faces and put the distances segregated by "-". Get the preview the offsetted faces. Press Enter to generate them.
Now, go to window tab and click on default tray and check all the trays on the right hand side are selected.
To get more updates, go through the following link www.wisext.com
Watch the following video tutorial to get online demonstration of the extension.