WHat si the difference between Free and Paid?

Before buying Komento I installed the free one. I removed it and then I installed the paid one but I don't see any difference. As well I have problem to make it works. It doesn't force to do the moderation and the catcha. So anyone can post comments. I have:
Joomla! Version Joomla! 3.2.2 Stable
Joomla! Platform Version Joomla Platform 13.1.0 Stable
PHP Version 5.3.3

Regards,
Alfonso