I think if you downloaded it off unprotected HTTP, it can be taken in good faith that payment is optional.
You can't give out candybars on the street, wait for people to eat them, and then ask for money. You have to establish the terms of the trade before you trade, and unprotected HTTP is akin to saying "FREE SH*T, COME AND GET IT!"
So, being as how I downloaded it off their website before they took it off...