demo not working

Attempting to visit the Server 5 online demo results in this:
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, root@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.
Apache/2.0.52 (Red Hat) Server at demo.open-xchange.com Port 80
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The Hosting Edition demo works but I would like to view the Server 5 demo too.

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