You have to locate the .htaccess file for your website you want to apply the redirect to.
For primary website, it will be located in the public_html folder.
Open .htaccess file using any editor and at the top of the file, copy and paste the following code:
RewriteEngine On
RewriteCond %{HTTPS} on
RewriteRule (.*) http://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]
# Save .htaccess file.
Now your website will redirect from https:// they will be redirected to http://
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