kelly:
Thanks for the clarification.
The download for AntiAlias is the .dll itself.
Perhaps you downloaded the Source Code.
Try downloading the .dll again.
The download link is just below the kitten pictures.
Most likely you do have the current version of PdN, you can check for sure, by opening
PdN, clicking Help > About.
Also, is there anything in the Effects folder other than the Tile fill .dll? If so, what?