EDD Straight-Up Free Download Button

/**
 * Convert buy buttons to straight-up download buttons if the download is free
 *
 * @since    1.0.0
 * @link     http://mintplugins.com/doc/
 * @see      function_name()
 * @param    array $args See link for description.
 * @return   void
 */
function mp_edd_free_edd_purchase_download_form( $purchase_form, $args ){
	
	//Get price
	$price = get_post_meta( $args['download_id'], 'edd_price', true );
	
	//If the price is greater than 0
	if ( $price > 0 ){
		//Return the normal button
		return $purchase_form;	
	}
	//If the price is 0
	else{
		
		//Get deliverable file
		$deliverable_file = get_post_meta( $args['download_id'], 'edd_download_files', true );
		
		//return a button that links to the deliverable in a new window
		return '<a class="button edd-free-download-btn" target="_blank" href="' . $deliverable_file[0]['file'] . '">' . __( 'Download', 'edd_free_downloads' ) . '</a>';	
	}

}
add_filter( 'edd_purchase_download_form', 'mp_edd_free_edd_purchase_download_form', 10, 2 );