Did you do the following?
1 - Start IconPackager
2 - With the "Packages" category selected in the upper left of configuration panel, select a theme from the list in the center of configuration panel.
3 - Click the "Load" button.
4 - Click the "Apply" button.
5 - Wait a few seconds for IconPackager to apply the theme.
Note - this assumes you are running IconPackager full, or the trial version (within the trial time period).
