Unable to install Prestashop:
PLESK_ERROR:Error: Unable to install the app because its installation requirements are not met. Contact your hosting provider to resolve this problem.
The 'mcrypt' extension was not found.
The 'mysqlnd' extension was not found.
The PHP verion 5.4 is in use.
These extensions are not available in the PHP version 5.4.
Switch the PHP version in PHP Settings menu to 5.6 or higher in Domains > example.com > PHP Settings.