Classibase.com is running on latest version of WordPress (currently 3.5.2)
Classibase Classifieds script is not running on wordpress it is separate script. Demo of classibase installed in “demo/” folder, where wordpress installed on “/” root folder. there is no integration between them.
If you want to display latest ads from your classifieds site on wordpress then use RSS widget for wordpress and enter feed url as http://yourdomain.com/rss/ , you can display date of posts as well by selecting “Display item date” checkbox.