"Video Filter missing" in Adobe Premiere
There's one way I know of to find the clip that is using the filter. Inside the timeline, you will see a small badge with the letters 'fx' on your clips. If it it grayed out, there is no effect applied. If it is colored purple, yellow, green, or red, then you have an effect on the clip. You can read about that more here...
http://helpx.adobe.com/premiere-pro/using/applying-removing-finding-organizing-effects.html

You can find the plugin file in your After Effects folder. 


Windows - Program Files\Adobe\Adobe After Effects\Plug-ins
Mac - Applications/Adobe After Effects/Plug-ins