Changes the number of downloads displayed in the latest downloads section of the store front template.
<?php
/*
 * Plugin Name: Easy Digital Downloads - Digital Store Theme - Latest Downloads Number
 * Description: Changes the number of downloads displayed in the latest downloads section of the store front template.
 * Author: John Parris
 * Author URI: https://easydigitaldownloads.com/
 * Version: 1.0
 */

function jp_ds_latest_downloads( $atts ) {
	$atts['limit'] = 3; // Set this number to whatever you want
	return $atts;
}
add_filter( 'digitalstore_latest_downloads_atts', 'jp_ds_latest_downloads' );
To implement this snippet on your site, create a brand new, empty WordPress plugin and paste the above code inside.