install c5 Version 5.7.3.1 with PHP-LPM

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Hello,

I'm trying to install C5 Version 5.7.3.1 with PHP-LPM and Mariadb on Centos 7.

and a file is missing (site_install.php)in the C5 package. The following messages appear :

{"error":{"message":"Concrete\\Controller\\Install::run_routine(): Failed opening required '\/var\/www\/mysite\/application\/config\/site_install.php' (include_path='\/var\/www\/mysite\/concrete\/vendor:.:\/usr\/share\/pear:\/usr\/share\/php')"},"errors":["Concrete\\Controller\\Install::run_routine(): Failed opening required '\/var\/www\/mysite\/application\/config\/site_install.php' (include_path='\/var\/www\/mysite\/concrete\/vendor:.:\/usr\/share\/pear:\/usr\/share\/php')"]}

Can somebody help me?

(sorry for my english)

komitas