Before I buy the XF script, I want to be sure that it will run on my server, so I checked with xenforo_requirements.php script, and there was a problem:
The required PHP extensions for XML handling (DOM and SimpleXML) could not be found. Please ask your host to install these extensions.
I updated php-common and php-xml, and the result was the same. Are there any other solutions instead of installing zend server?