Hi Francesco, when you purchase MoI there is a license key sent to you through e-mail, and also a link for downloading the full v1 install, which is a separate installer from the trial version.

The first time that you run the full v1 version it will ask you for your license key, and you can paste the one that was sent to you in e-mail in and then it is all set up.

There isn't any kind of "unlock" thing for the trial, when you purchase it you get the full version and you just uninstall the trial and instead install the full version.

- Michael