That may be the best advice, but I've got to come up with a way to figure out a number.
$200! It was Google that is distributing the copy without you kowledge or permission. Unless the author verifies that he had some sort of Harry Potter hit on his hand, tell him its going to cost him more in attorney fees then he’ll ever get out of you!
Be careful coming up with a number to pay him. If you go that route you definitely need a lawyer to draft it and release you from further claims.
Making him an offer will soften him. I would figure on somewhere between 1/2 and 1/3 of those who access the pdf and multiply that by how much he charges for the download.
If you offer based on 1/3 he may bite you can also say it’s all you can afford. Get it behind you, you are obviously upset best to settle it now. Good luck! I am heading in for a knee replacement and won’t be able to answer you anytime soon. But do let me know how it goes.