Do you have a Plugins menu? And did you restart SketchUp after installing the plugin into the Plugins directory?
If there is no Plugins menu, go to Window>Preferences>Extensions and tick the boxes you find there.
If you haven't restarted sketchUp, close it and re-open it.
this is copied from the instructions included in the plugin file. You can open and read .rb files in any text editor.
@unknownuser said:
Usage: 1. Select entities.
[IF there's no selection ALL active entities are used]
2. Activate the script from the Plugins Menu.
3. Choose Old Material [to be replaced].
<< DEFAULT-FRONT >> = NO Material on Front-Face
<< DEFAULT-BACK >> = NO Material on Back-Face
<< DEFAULT >> = ALL Entities that have NO Materials
(e.g. Front AND Back Faces, and Text etc)
<< ALL >> = ALL Materials (Any Face and Any Entitiy)
and then an Alphabetical list of other Materials in the Model.
4. Choose the desired New Material.
[<< DEFAULT >> = No Material]
To access Materials that are off the visible list type
the first letter - e.g. 'W' and use up/down arrow-keys
to move to the one you want e.g. 'W'hite..
