Noted That:

• To install correctly this additional-content.zip .
• Fisrt Download the additional-content.zip to your computer
• Extract/Open additional-content.zip to Your Computer.
• Then, Find readme.txt file inside additional-content.zip and Open readme.txt .
• Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
• Then, Follow the Tips Below.

Start the Tips:

1. First Download " additional-content.zip " Plugin to your Local Computer. (Click Download)

2. Then, Login to your " yourdomain.com/wp-admin " Dashboard.

3. Then, Click on " Plugins " + " Add New " from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse " additional-content.zip "  Downloaded plugin from your computer, Where you downloaded additional-content.zip According to Step – 1 Above then, click on " Install Now"

6. Now, Click on " Active Plugin"

7. Then, See left sidemenu. " Additional Content " folder is added on left sidemenu. Now, Click on " Additional Content " folder.

   Noted that: If you do not see " Additional Content " folder on left sidemenu then, see at left sidemenu " Settings " or " Tools ".

8. Now you configure yourself oR Watch video tutorial below about  Additional Content Configurtions and Settings or How to work " Additional Content " in your WordPress site.

After Activated Plugin According to Step-6 then,

1. Go to " Plugins " + " Installed Plugin " from Wordpress Admin Panel Leftside Menu.
2. or Direct go to: https://yourdomain/wp-admin/plugins.php
3. Then, Find " Additional Content " Activated Plugin from Plugin List.
4. Then, Click on " Settings " from Plugin that is Additional Content
5. Now, Edit/Add/Config the setting and Click on " Save Changes " button,

Requirements

PHP 5.4.0 or higher

Note : This plugin displays an admin notice when activated on lower PHP versions. Disable this plugin like you normally would in the wp-admin if you see this notice.

What is PHP?
PHP is the scripting language used to build WordPress. It’s installed on your server by your host. The minimum required version for WordPress is PHP 5.2.4. This version has been unsupported since early 2011 and is potentially insecure. WordPress supports it to maintain backward compatibility for sites that are still using it.

This plugin is also build with PHP but it requires the PHP version of 5.4.0 or higher to work.

Follow these instructions to install the plugin.

1. In your WordPress admin panel, go to Plugins > New Plugin, search for “additional content” and click “Install now”.
2. Alternatively, download the plugin and upload the contents of additional-content.zip to your plugins directory, which usually is /wp-content/plugins/.
3. Activate the plugin
4. Add additional content in the edit or publish post screens.