Does not replace standard WP 404 page

As you can see from the countless positive reviews the plugin works. If it doesn’t work for you, this must be caused by a problem in combination with the theme you are using or another plugin. If you want to use the plugin on your site then follow the steps described in this checklist https://petersplugins.com/please-follow-these-simple-steps-if-you-have-any-problems-with-one-of-my-plugins and create a support ticket https://www.ads-software.com/support/plugin/404page.

Regards,
Peter