The expired trial version works perfectly well so I have no intention of actualyl doing what I discuss here but:
Considering the software was offered free in unlimited quantities on multiple dates, wouldnt you feel somewhat justified in the use if a pirated copy? It's time to get into bad analogies but as long as they were the same version, wouldnt this be essentially no different than somebody going to a store where they were giving away some sort of free software in unlimited quantities and just taking a stack of them, You decide you want the software after the fact and he gives you a copy. Winrar never recieved money but you recieved software on a non-free day.
Granted no pirate would downlaod a bunch of "copies" of this or fetch a bunch of keys--they would just crack it--but as long as I looked at this deal and new it was free, I certainly wouldnt feel bad cracking my trial copy if the trial copy ever stopped doing what I need it to do.