Ah see there's your problem. You need to make sure that the resolution of those .zip files matches your phone. You can always ask the author what resolution the theme is designed for. We recommend using this link, and then changing the resolution at the top filter to match your S4. These aren't the official themes, therefore we can't guarantee they will work.
Hope this helps!
Apply beautiful themes to your phone in one click with Themer by MyColorScreen.
Over the years, since evenbefore Android entered the scene, we have striven to … more
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?