How to switch static files back to using HTTP instead of HTTPS?

Rocky.

You can try these:

1. make sure the values changed in database

If you can’t login to
wp-admin > settings to confirm that, you can go to database, wp_options table and look for siteurl and home values

2. add code to wp-config.php

Add these lines to wp-config.php

  define('WP_HOME','http://example.com');
  define('WP_SITEURL','http://example.com');

3. Clear your cache

Make sure that you clear the cache from any cache plugins you’re using and also from your browser

Also try adding this to wp-config.php (note “false”)

  define( 'WP_CACHE', false );

4. check https / ssl related plugins

You might be using any plugin which is causing this, like ssl insecure content fixer, etc.

5. Cloudflare or other dns side redirect

Make sure that the site isn’t using any dns based redirect

6. disable all plugins and confirm

7. change theme to default and check

Let me know any issues with this