Drupal 6 Modules
A review of the currently installed modules on the Drupal 6 showed that most are now part of Drupal 8 Core, in particular:
The obvious module that stands out is the XML Sitemap.
To install that module, again using Drush
Issue Note that the command was simplesitemap not simple_sitemap
MAMP Nginx 404 error - Switch to Apache
I have had to switch, hopefully temporarily to using the Apache Server with MAMP because although the main page (homepage) works fine, all others give 404 errors.