I bought the pro version after successfully tying the lite version. However the results page still looks exactly the same as the lite version and original wordpress search results page. I have chosen the some other templates but nothing seems to change no matter what I do.
The results page layout cannot be affected by the plugin – it is fully controlled by your theme (or a page builder plugin if the theme has integration to it). The only way to change the results page design is via the theme (changing the configuration or edigint the source code).
If this is the only reason, then probably. I suggest looking around on the back-end options, or checking the documetnation. I’m sure you will find a useful feature 🙂