No, you shouldn't pay. Just get your copy for free and make experiments with it. If you don't like what happens - just remove it and that's it. No need to pay or cancel something.
Should be you are using the "WPFTS :: Live Search" widget. This widget is intended to show this live search data. If you don't want them, simply use the native WP Search widget.
Please could you follow this small guide? If it does not help, write to me here again. I will need to know the theme you're using and, possibly, the URL of your website to make some checks.
