The suite has an easy way to switch between themes, if you have download one just put the folder into the
Templates folder.
Click on
configuration on the top menu and in the dropdown menu click on configuration x tools.
In the configuration panel, click on the green fan icon:
This will bring you to the following screen, where you can select your theme of choice. In this case the theme is called
newtheme:
Select the theme you want to use and click on
Change Style.