The activation data didn't send to our server.
1. Check if the computer is connected to the internet.
2. Check if the Gaaiho applications are allowed to communicate through Windows Firewall. Go to "Control Panel > System and Security > Allow an app or feature through windows firewall > Change Settings > Allow another app". Then Add Gaaiho Doc, GZNAbout, GConvertToPDF (GPDFDirect in older versions) applications under the path "%SystemDrive%\Program Files (x86)\Zeon\Gaaiho\Gaaiho PDF Suite\bin".
3. Reactivate Gaaiho Applications.