If there error like this :
Site error: the file /home/xxx/xxx/wp-content/plugins/seo-alrp/php/admin/registration.php requires the ionCube PHP Loader ioncube_loader_lin_5.3.so to be installed by the website operator. If you are the website operator please use the ionCube Loader Wizard to assist with installation.
This mean is some module on Php (also httpd) after install is not make his config.
So make sure after install (you can check with 'yum list | grep ioncoube')
and make this file 'vi /etc/php.d/ioncube.ini'
with this value 'zend_extension=/usr/lib/php/modules/ioncube_loader_lin_5.3.so'
this mean you use 5.3 (change with not right value, check with 'php -v').