1. Purchase from official website
If you lose your code, please go to License Retrieval and get your code back.
2. Purchase the paid version from Apple Mac App Store
3. Download the free/lite version from Apple Mac App Store
If you download the free version, PDF Reader Pro - Lite Edition, from Apple Mac App Store, and purchase 6-Month License, you don’t need to enter license code either, but to restore your previous purchase.