Upgrading from the trial to the main game, do I have to re-download?

Hey! I decided that I'm going to purchase the full version of a realm reborn and get a subscription. I already have the trial version on my PlayStation three and a saved character on there, when I buy the new version do I have to re download the full game, or is there a way that I can just put in a purchase code and not have to use the extra space on my PS3? And if that is the case where do I find my Purchase code? I'll help is greatly appreciated, thank you!