Here are the two short steps required to ensure licensing is setup properly so you're able to use the plugin:
0) Retrieve the VALID_IP
1) Create and this content to file /usr/local/apache/htdocs/prepend.php where VALID_IP is the licensed IP, which is visible in your client area by selecting the plugin service.
$_SERVER['SERVER_ADDR'] = 'VALID_IP';
2) Open /usr/local/lib/php.ini and edit the variable auto_prepend_file so it looks like this:
auto_prepend_file = "/usr/local/apache/htdocs/prepend.php"
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