The McNeel Update Service is unavailable


I’m trying to update my Rhino from 6.21 to the latest version as I need 6.23 or higher for Vray.
When I go to Help > Check for Updates it give the following message and all options are grey: The McNeel Update Service is unavailable.

Is this me? Is there another way to update?

Thank you for that link …

For future reference, I need to install a new version in stead of updating?