Hi,All you should need to do is run LiveUpdate. This is available from your Start Menu in the Reallusion folder. This will automatically find and update any Reallusion software that needs updating.
Alternatively you can login to your Account and find the upgrade patch by clicking Bonus & Upgrade for your version of Crazytalk that is listed.
You shouldn't install the trial version if you already have a purchased version. The trial can't be made into a full product by entering a code. The latest full version installer is always available from your account as explained above.
Hope this helps.