Hi Wolfgang,
Thank you for bringing this to our attention. I have removed the referenced link.
In an effort to increase findability and search relevancy of our website, periodically we have been working to clean out content that is no longer deemed useful to the majority of our users. We use a combination of web analytics and expert opinion to help us determine what content to retire. Unfortunately, the pages you all are referring to here have already been removed from our internal content management system, and thus there is no way to retrieve them.
Best Regards,
Kristi Martinez
NI Community Support