Navdata center buttons greyed out

I am trying to update for the newest AIRAC but when I load the Navigraph Navdata Center all the buttons are greyed out and there is no response if I try to click on them.

Hi…,

Welcome

Please disable Antivirus and any Firewall, uninstall, redownload and install Navigraph Navdata Center. Please restart machine.

Any improvement?

Cheers
Ian