If you have a working Internet connection and you're sure that your firewall is not blocking the application, the error can usually appear either because you don't have the latest version of DriverToolkit installed on your PC (which means that you need to update the app itself) or because you haven't yet paid for the application (which means that the tool requires you to purchase it before it will actually attempt to help you).
On a personal note, I would strongly advise against using this kind of application, especially if they cost this much, but it's completely up to you if you wish to heed my advice or not.