Go to https://userarea.d16.pl/index.php and log in if you have an account or create one if you don’t.
Then find the link to unlock your software inside the user area. When you enter the code you received from us you will be able to download the keyfile. Keep that keyfile in a folder that’s easy to find for you. Save it in the same folder as the installer file. When you’ve got the keyfile on your drive you can access it from within any of the D16 products.
Next time you launch your demo/trial version of the plugins click on Activate – a window will open and it will ask you to point to the keyfile. You should know where you have saved it by now.