If you're getting a blank page that means there are some problems with registration of your copy of PDF Viewer for WordPress. Follow the steps below to resolve this issue:
- Navigate to PDF Viewer > Activation & Updates Menu
- If your copy of PDF Viewer is not registered on this page, Register it using your purchase code
- If its registered but still having issue, then deregister and register again with your purchase code.
That should resolve your issue, if you're still having any issue after following the steps above, please create a support ticket.