Internet fails

Hello i have this problem in Dopus that i receive this message : connecting to internet fails.
I have tried to insert directly the address to my browser and the answer is 'unsafe'. I have investigated and i have seen that the problem is that the certificate is not inserted in the certificate program of my Windows 10 64 bit Pro. Second this certificate is no longer valid.
Can you help please?
Best regards.

That isn't one of our websites. We have no control over it or its certificates.

You could ask @tbone for help, he runs the site.