In the just released RAW files db pages, for some reason, clicking on raw file links does not work directly (Chrome or Firefox), just right-click then 'Open link in new tab'
When you noticed an issue, what camera were you trying to download files from? Or is it with any camera that you try?
Any, from any raw db page, including raw's from the article https://photographylife.com/news/photography-lifes-raw-image-database-launched
You would need software capable of opening that file type, or a Codec for your operating system to be able to view that file type.
So you would download the raw then if it was a Nikon file it might open using nx studio or Lightroom for example. A Canon file would use DPP4 or Lightroom Or if your operating system was updated with the codec then you could view the file.
A raw file is not an image file. Just the data that has to be made into an image by raw converter software such as Lightroom.