Activation Pdf Architect 4 module

Hello ,

I have a problem with the activation of the free module of PDf architect 4. I received by e-mail the
unlock code and once you have entered the error message appears:

Sorry, it was impossible to activate pdf architect 4.Try one of the following options

-Check your internet connection

-Copy / paste your license key to avoid errors

The PC. is equipped with Windows 7 x64, I have disabled the firewall and antivirus.

Thanks for your help.