Parse err.: syntax err., unexpected T_FUNCTION in class.http.inc.php on line 105

[info3255]

server: PHP Version 5.2.6-1
sitemap generato version: PRO version downloaded on 11/4/2018

opening index.php the generator show this error:
Parse error: syntax error, unexpected T_FUNCTION in /var/www/vhosts/andreajatta.it/httpdocs/sitemap/pages/class.http.inc.php on line 105
thanks in advance for any help.
Andrea

[XML-Sitemaps Support]

Hello,

what is the version of PHP running on the server?

[info3255]

server: PHP Version 5.2.6-1
I've just written... 

[XML-Sitemaps Support]

Hello,

please let me know your generator URL/login in private message to check this.