I played it just about 2 weeks agoand it was working. It doesn't show in my recent downloads at all like it was a ghost. It is on the hard drive however.
I'm going to guess, given that the game is no longer on your download list, that you played the 60 minute Full game trial, which expires 60 minutes after you start it up, whether you play the full hour or not. If you did not 'purchase' the game while it was on the IGC, then you did not recieve the PS+ license for it. Sorry.