Not sure if it still works, I can only add the game to my cart and the full game trial is not even available.
Just looked around, only free game trials available are for Chains of Sparta and Chains of Olympus. I have no clue what you're talking about.
EDIT: Seems they took down the Timed Trials for both games hours ago. OP snoozed pretty hard on this one, it was discovered yesterday night. Dead deal.