After downloading an unzipping the file, add the single.php file to your child theme folder, either via FTP or cPanel.
Copy all the content in the css.css file and paste into your child theme stylesheet, or Divi > Theme Options > Custom CSS.
Copy the contents of the js.txt file and paste into Divi > Theme Options > Integration > Add code to the < head > of your blog.
Copy the contents of the php.txt file and paste in functions.php in your child theme.
Clear all your caches and view a post to see your new layout.
Note: This layout is designed for posts NOT using the Divi builder.