Be sure your software meets the requirements of the Content Egg plugin:
PHP 5.3 or higher.
Wordpress 4.6.1 or higher.
The manual plugin installation is the same as any other installation of the Wordpress plugin:
Download a ZIP archive of the plugin from your user panel or your license provider.
From wp-admin interface select
Plugins -> Add New.
Choose File and select Сontent Egg PRO zip file.
Activate the plugin through the
Plugins menu in WordPress.
Input the active license key. You can find the key in your user panel or in your license provider.
Please find here the releases notes.