The only place where you can download the plugin is on wordpress.org itself. So if you see the plugin somewhere else don’t download it and please inform me about it. When you download the plugin from any other location than the one below there will be a possibility it is a virus.
It is also advisable to update the plugin. Most of the updates consists of new functions but it can also be fixes for existing functions.
Download link: http://wordpress.org/extend/plugins/tradetracker-store/