License code is only for the dmg version downloaded from our website. If you can't find "Enter License", please make sure that you use PDF Reader Pro / LynxPDF Editor dmg version.
If there are different versions of PDF Reader Pro / LynxPDF Editor on your device, we recommend that you uninstall all, restart your device, and redownload PDF Reader Pro from here. (redownload LynxPDF Editor from here)
Then apply your license code:
1. Click PDF Reader Pro / LynxPDF Editor-> Enter License at the upper left.
2. Enter the license code and click Continue to activate.
Note: If you can't find "Enter License", please download PDF Reader Pro / LynxPDF Editor.dmg.
Because you don't need to enter license code if you download it from Apple Store.