Hi,
I just looked , updated the Woocommerce plugin and updated to 3.5 and same thing is happening to me. Please hold on I am reinstalling the theme again to see what modifications Woo made to the plugin .
Ok. This is what needs to get done. Paste this chunk below over lines 720-750 of the fresh config.php file the end points (lines 720 and lines 750 should match up to the starting and ending line below.
remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_product_data_tabs', 1 );
//add_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_product_data_tabs', 1 );
#
# display upsells and related products within dedicated div with different column and number of products
#
remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_related_products',20);
remove_action( 'woocommerce_after_single_product', 'woocommerce_output_related_products',10);
add_action( 'woocommerce_after_single_product_summary', 'avia_woocommerce_output_related_products', 20);
function avia_woocommerce_output_related_products()
{
global $avia_config;
$output = "";
ob_start();
woocommerce_related_products($avia_config['shop_single_column_items'],$avia_config['shop_single_column']); // X products, X columns
$content = ob_get_clean();
if($content)
{
$output .= "<div class='product_column product_column_".$avia_config['shop_single_column']."'>";
add_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_product_data_tabs', 10 );
//$output .= "<h3>".(__('Related Products', 'avia_framework'))."</h3>";
$output .= $content;
$output .= "</div>";
} else {
add_action( 'woocommerce_after_single_product_summary', 'woocommerce_output_product_data_tabs', 1 );
}
$avia_config['woo_related'] = $output;
}
You can take a look at this image to see what's going on. http://i.imgur.com/tVzKs.png
Thanks,
Nick
Create a new thread and tell me what problems you are encountering and what you want to know. 
There is no step 3 :) 
