There is only one version. The trial is a 30 licence. Enter your serial number to convert it.
Help=> Registration=> Licence.
The trial version is the full version of Lightroom. It's just wrapped in a control function that will only allow it to run for 30 days. When you start the trial version and the trial screen appears, there is an option to indicate that you have a serial number. Choose that option, and you will be able to enter your serial number. Your trial version will be transformed to a licensed version of Lightroom.