What I find interesting is that Bentley seem to be renewing on a four year cycle (assuming the last update was a renewal) and it would be far simpler from an administrative perspective to renew all domain names at the same time. They have all been transferred to the same registrar I think so this would be really simple to do. But the recent updates to Cornucopia3d seem to have been for some different reason. Note that the redirects for e-on and cornucopia3d seem to be going to designated dns servers which is also odd.

So maybe they are not going to renew the domains. Nothing bad about that although you would want to hang onto them for a while to cover the transition period and May of this year is not that far away for cornucopia3d.com. Maybe they are trying to integrate with the Bentley site - LumenRT is there already - and it has gone pear shaped...well that should not kill off the old sites and normal services can be resumed while you lick your wounds and get ready to try again.

The only reasons for an extended outage are either (1) the site and all its data is lost...including backups... or (2) extreme incompetence managing an upgrade, or, finally (3) they are in the process of dumping it.

I seriously doubt it's your third option. Of your first two, the latter seems a bit more likely. I'm thinking it was something inadvertent, accidental, and, unfortunately, catastrophic. The kind of thing a new policy will be written especially for. The kind of policy with someone's name on it ("....oh yeah, that's new, it's the "Gary" policy..."). At least now they have something of a website up and a means of contacting sales or support personnel. I think if the lights were going out they wouldn't bother to waste resources and money any further.