You simply need to update your license activation code. If you are going to be running a paid installation of SPSS Statistics or Modeler on the same machine that you used for the free trial then you do not need to download the software again.
What happens at the end of my free trial or when my licence comes to an end? To update it, simply follow the instructions below. We will supply you with a new code at the point at which you buy the new software licence. When your licence comes to an end you will need to buy a licences, you do not need to reinstall the software you simply need to update your license activation code.