Generally speaking, Adobe stopped updating older versions to be able to read raw files from newer cameras when they released a new major version of Photoshop. Thus Photoshop CS5 is no longer receiving Camera Raw updates.
First you need to determine whether Adobe had released support for your new camera in your version of Photoshop. To do that, look at these two pages. You'll want to find out the earliest version of Camera Raw that can support your camera, then what version of Photoshop can run that version of Camera Raw.
If you find your camera is supported by your version of Photoshop, you need to download the latest update for Camera Raw. There's more information on how to do that here:
If your version of Photoshop cannot support your camera, you can download and install the latest version of the free Adobe DNG Converter, which can take your raw files as input and put out DNG format files, which your version of Photoshop can open.
The DNG converter DOES work, but if you want maximal quality from your raw files (not to mention the convenience and ease of use of directly opening your raw files) you'll want the latest version of Photoshop. Adobe has made substantial improvements in raw conversion quality in recent years.
In case it's not clear, Photoshop CS5 is NOT able to open D610 files directly, so you either need to use the DNG converter or upgrade to a more recent version of Photoshop (CS6 or newer).
You could consider this: