We'll create fresh WordPress site with Theme File Duplicator installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Now fully compatible with child themes. Clone an existing template file without uploading new files via FTP. Optionally, a user can add a template name, so that the new file will be automatically recognized as a new page template in the post editor. If using a child theme, the new file will be copied from the parent theme folder into the child theme.