1. Download PDF Reader Pro.exe. Install and open a PDF file. Click "Activation" upper left -> "Input License Code".
2. Enter the license code and click "OK" to activate.
Note: PDF Reader Pro supports 7-day free trial, so you can enjoy all advanced features within 7 days before you purchase it. Click "Free Trial", enter your name and email address to activate. If you can't find "Activation", please download PDF Reader Pro.exe. Because you don't need to enter license code if you download it from Microsoft Store.