Create subdomain, database and database user in Plesk. ssh into the server and cd to the subdomain directory As root create a conf/vhost.conf file with the php.ini overrides $ vi conf/vhost.conf <Directory /var/www/vhosts/example.com/subdomains/vtiger/httpdocs> php_value display_errors On php_value max_execution_time 600 php_value error_reporting E_WARNING & ~E_NOTICE php_value allow_call_time_pass_reference On php_value log_errors Off </Directory> Reconfigure and restart Apache. $ /usr/local/psa/admin/sbin/websrvmng --reconfigure-vhost --vhost-name=vtiger.example.com $ /etc/init.d/httpd stop; /etc/init.d/httpd start Download and untar the vtiger package $ wget https://sourceforge.net/projects/vtigercrm/files/vtiger%20CRM%205.2.0/Core%20Product/vtigercrm-5.2.0.tar.gz $ tar zxf vtigercrm-5.2.0.tar.gz $ mv vtigercrm-5.2.0 httpdocs As root set apache as the owner for some vtiger files $ cd httpdocs/ $ chown -R apache:apache config.inc.php tabdata.php install.php parent_tabdata.php cache cache/images/ cache/import/ storage/ install/ user_privileges/ Smarty/cache/ Smarty/templates_c/ modules/Emails/templates/ modules/ cron/modules/ test/vtlib/ backup/ Smarty/templates/modules/ test/wordtemplatedownload/ test/product/ test/user/ test/contact/ test/logo/ logs/ modules/Webmails/tmp/ Run the install http://vtiger.example.com/ Remove the installation files $ mv install.php install.php~ $ mv install/ install~