Once you have paid for the plugin, you will receive a download link via email. Unzip this file and you will see the plugin folder and a readme.txt To install the plugin you have two choices, you can upload it via FTP or upload it within WordPress.
To upload via FTP you will need an FTP client, FileZilla is a good program you can use for free. Unzip the WPAdCenter.zip file and connect to your website via FTP.
Navigate to the wp-content/plugins folder and upload the WP-AdCenter folder from your computer.
To upload the plugin via WordPress, login to your WordPress admin panel and go to “Plugins” > “Add New” > “Upload” and upload the WPAdCenter.zip file.
Click “Activate” underneath the WP AdCenter plugin, once this is done you will see a new menu item added to your side menu called “WP Ad Center”. The plugin is now installed and you can begin configuring it.