Application license keys allow you to use the downloaded version indefinitely. The license allows major version upgrades for 1 year. (The major version number is the first two parts of the version string eg 3.1 for a version string 3.1.108). Minor version upgrades can be applied indefinitely.
Top-up licenses (Windows only) add to the number of Premium face recognition transactions which can be performed. If multiple top-up licenses of the same value are required, there should be more than 10 minutes between downloads, or licenses after the first will not be recognized.
After payment, you can download your license key. An email containing a link to the license key will be sent to your Paypal email address. Check your spam folder as the email may be routed there. Please contact firstname.lastname@example.org if you do not receive your license key.