<?php

function expand_access_subscription_downloads( $is_download_permitted, $subscription ) {

  if ( $subscription->has_status ( 'cancelled', 'expired' ) ) {
    return true;
  }
  return $is_download_permitted;
}

add_filter ( 'woocommerce_order_is_download_permitted', 'expand_access_subscription_downloads', 10, 2 );