Dashboard Istat Pro

Hello,

I just updated this widget called Istat Pro (monitors all hardware parameters) and the old version of this widget was sent to Trash. Now, I can't fully empty Trash because it says Istat is being used. I really have no idea of what to do. I've tried to disable the widget, and the widget can't be removed from Trash. Any ideas/thoughts would be greatly appreciated.

Thanks,

Andy