Can I delete "free trial" memory from the computer?

I'm curious on how (if there's a way) to delete from the computer memory the information previously installed along with the "free trial download games" (ie. pogo) so I may install the download and play the trial again. I've tried to uninstall the trial (Dream Chronicles) and re-install it, but the same screen pops up telling me "your free trial has expired" and I must purchase the game. I'm pretty sure there's a loophole to this without needing to purchase it, and I'm asking any and all computer savvy persons out there for your input. Thank you