Always contact official support. Do not search for "alternative keys" – that will only lead to trouble.
: If you are using an older version (like Prepros 6), discounted upgrade keys are available for newer versions. How to Use a License Key : Buy a key from the Prepros Buy Page using PayPal or a Credit Card. Activation Prepros License Key
If you encounter any issues with your Prepros license key, please ensure that: Always contact official support
Searching for a on shady forums might save you $29, but it risks your computer’s security, your client’s data, and your professional reputation. but it risks your computer’s security