You can install the free version in your WordPress dashboard under Plugins > Add new > and search for Complianz. If you want to install the premium version, you will need to download the .zip file from your account on Complianz.io or use the link in the purchase confirmation by e-mail.
After downloading the .zip, you can upload the file under Plugins > Add new > Upload. Here you can enter your license key and use our premium plugin. The free settings will be applied to your premium plugin and deactivated afterward automatically.