Custom 404 template for Volatyl - CREATE a file in the ROOT of your Volatyl CHILD THEME and name it 404.php. Paste the code below into that file. This works for both Volatyl and Volatyl for EDD.

404.php

<?php
/** 404.php
 *
 * custom layout for 404 error pages -- place this file in the
 * root of your child theme and WordPress will use it instead of the
 * original 404 template. Edit this file as you wish!
 */

$options_structure = get_option('vol_structure_options');

// Custom filters 
$error_404 = apply_filters('error_404_content', array(
    'error_title'	=> 'Oops! Looks like we have an error.',
    'error_content'	=> 'Use the search form and other tools below to find what you were looking for.'
)); 

get_header();
vol_html_before_content();

// HTML structure flexibility
if ($options_structure['wide'] == 1) : 
	echo "<div class=\"custom-404-area full clearfix\"><div class=\"main\">";
else :
	echo "<div class=\"custom-404-area clearfix\">";
endif; ?>

	<div class="custom-404 inner">
		<article id="post-0" class="post error404 not-found">
			<header class="entry-header">
				<h1 class="entry-title">
					<?php _e($error_404['error_title'], 'volatyl'); ?>
				</h1>
			</header>
			<section class="entry-content">
				<p>
					<?php _e($error_404['error_content'], 'volatyl'); ?>
				</p>
				
				<?php 
				// output search form
				get_search_form();
				
				// output recent posts and categories widgets
				the_widget('WP_Widget_Recent_Posts'); ?>
				
				<div class="widget">
					<h2 class="widgettitle">
						<?php _e('Most Used Categories', 'volatyl'); ?>
					</h2>
					<ul>
					
						<?php
						wp_list_categories(array(
							'orderby' 	=> 'count', 
							'order' 	=> 'DESC', 
							'title_li' 	=> '', 
							'number' 	=> 10, 
							'depth' 	=> -1, 
						)); ?>
					
					</ul>
				</div>
				
				<?php 
				// translators: %1$s: smilie
				$archive_content = '<p>' . sprintf(__('Try looking in the monthly archives. %1$s', 'volatyl'), convert_smilies(':)')) . '</p>';
				// output archives widget
				the_widget('WP_Widget_Archives', 'dropdown=1', "after_title=</h2>$archive_content");
				
				// output tag cloud widget
				the_widget('WP_Widget_Tag_Cloud'); ?>
			</section>
		</article>
	</div>

<?php
// HTML structure flexibility
echo (($options_structure['wide'] == 1) ? '</div>' : '');
echo "</div>";

vol_html_after_content();
get_footer();