Why Classifieds plugin not updating?

Hi, I downloaded the classifieds plugin through my wordpress/wpmu dashboard and directly from your site. I am getting a message that the plugin needs an update. I have tried updating by manual download from your site and automatically through dashboard, but the update available message for this plugin does not disappear. How do I get rid of the message? How do I know I have the latest version? I checked the plugin’s change log file I have and it says the last change was Arnold Bailey.