Q:
How to Access a Full Version of PDF Reader Pro?
A:

Access a full version of PDF Reader Pro to enjoy the advanced features:

1. Open the app and click Upgrade on the sidebar.

2. Then a comparision table between free and paid version pops up, and there are  two plans you can choose, 6-Months and One-time Purchase.

3. Finish your payment and enjoy the advanced features of PDF Reader Pro.

4. If you cannot run the full version after the purchase, please Restore your previous purchase inside the app.