Hi,
Thank you, that helps. So, as instructed by the author, you will have to replace the line 320 within the wp-content\themes\wp_oswad_market\framework\functions\main.php file, in the theme directory.
Replace it from this:
<div class="header_search"><?php echo my_search_form(); ?>
..to this:
<div class="header_search"><?php echo do_shortcode('[wpdreams_ajaxsearchpro id=1]'); ?></div>
That should very likely do the trick.