The freeware icons enclosed are provided to loyal customers as a token of appreciation. Install them as usual by using IConArtist. Remember, however, that after replacing the Finder icon, or the System icon, you normally have to rebuild the desktop to display the changes.
Simply restart while holding down the Option and Command keys, until a dialog box asks for permission to rebuild.
Replacing the Trash icon, or the Foder icon, doesn't require anything but a simple restart to show.