Projeqtor 6.4.3 with PHP 5.3.3 : Error during installation - by: Mams

Hi everyone.

This message just goes back to this error I encountered while installing version 6.4.3.

2017-10-31 22:46:35.758 ===== TRACE =====
2017-10-31 22:46:35.758 ===== TRACE ===== 2 ERRORS DURING UPDATE TO VERSION V6.4.3
2017-10-31 22:46:35.758 ===== TRACE =====
2017-10-31 22:46:35.758 ===== TRACE ===== =====================================
2017-10-31 22:46:35.758 ===== TRACE =====
2017-10-31 22:46:54.992 ===== TRACE ===== NEW CONNECTED USER 'admin'
2017-10-31 22:47:18.167 ***** ERROR ***** [V6.4.3] ERROR *****
2017-10-31 22:47:18.168 ***** ERROR ***** [V6.4.3] on file '/var/www/html/projeqtor/tool/projeqtor.php' at line (2596)
2017-10-31 22:47:18.168 ***** ERROR ***** [V6.4.3] cause = file_get_contents(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution
2017-10-31 22:47:18.168 ===== TRACE ===== Cannot check Version at projeqtor.org/admin/getVersion.php
2017-10-31 22:47:18.168 ===== TRACE ===== Maybe allow_url_fopen is Off in php.ini...
2017-10-31 22:47:36.007 ===== TRACE ===== DISCONNECTED USER 'admin'
2017-10-31 22:51:00.801 ===== TRACE ===== NEW CONNECTED USER 'admin'
2017-10-31 22:51:01.276 ***** ERROR ***** [V6.4.3] ERROR *****
2017-10-31 22:51:01.276 ***** ERROR ***** [V6.4.3] on file '/var/www/html/projeqtor/tool/projeqtor.php' at line (2596)
2017-10-31 22:51:01.276 ***** ERROR ***** [V6.4.3] cause = file_get_contents(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution
2017-10-31 22:51:01.276 ===== TRACE ===== Cannot check Version at projeqtor.org/admin/getVersion.php
2017-10-31 22:51:01.276 ===== TRACE ===== Maybe allow_url_fopen is Off in php.ini...
2017-10-31 22:51:56.324 ===== TRACE ===== DISCONNECTED USER 'admin'

Thank you for your consideration

Bests regards