Trying the plugin out on a local copy of the site on my computer using WAMP. When I go to select the themes none of them are showing up.
I noticed that it says
All of this theme’s files are located in C:\wamp\www\ncpolicywatch\wp-content\plugins\wp-mobile-detector/themes/bluesteel-mobile.
So there might be a problem there? It's using the computer directory path and not the localhost/ncpolicywatch/... path.