How do I redirect https to http without any SSL Certificate?

HTTPS relies on the SSL certificate being present and the SSL negotiation triggering before any data being sent to the server. Therefore a redirect from a https URL with no valid SSL certificate present, to a non-SSL http URL is impossible.

Install RapidSSL Site Seal

If you’ve secured your domain with a RapidSSL Certificate you can boost trust by displaying the RapidSSL site seal on your website.