Install the plugin using the Extension Manager and the download URL above, which points to latest version of the plugin. Refer to Plugins on how to install plugins manually.

After installation, you have to do much integration work. A first step is to include the fancysearch form in your template:

<?php
    $namespaces = array('nsid' => array('txt' => 'nscaption', 'img' => 'imglink'));
    $fancysearch = plugin_load('action', 'fancysearch');
    if (!is_null($fancysearch)) {
        $fancysearch->tpl_searchform($namespaces, 'allpagesimg');
    } else {
        tpl_searchform();
    }
?>

You will need much CSS styling as well.