PDF Reader Pro (Apple Store) means you download the app from Apple Store. You can upgrade to Permanent License or subscribe 6-Months Pro License to unlock the advanced features within the app.
Now, you are welcome to experience a 7-day free trial of PDF Reader Pro before you purchase it.
If you subscribed a 6-months license and still got a free version, please Restore Previous Purchase.
They share the same amazing functions to deal with your PDF documents on Mac.