Sort the downloads archive in Easy Digital Downloads by number of sales

edd-sort-archive-by-sales.php

<?php
/*
Plugin Name: Easy Digital Downloads - Sort archive by number of sales
*/
function jp_sort_downloads_archive( $query ) {
	if ( is_post_type_archive( 'download' ) && $query->is_main_query() ) {
		$query->set( 'meta_key', '_edd_download_sales' );
		$query->set( 'orderby', 'meta_value_num' );
		$query->set( 'order', 'DESC' );
	}
}
add_action( 'pre_get_posts', 'jp_sort_downloads_archive' );