Unfortunately, Photoshop CS5 is not going to be able to open your D610 files directly.
The camera is newer than the latest update for your version of the software. Adobe stopped updating older versions to be able to read raw files from newer cameras when they released a new major version of Photoshop. Photoshop CS5 is no longer receiving Camera Raw updates.
To double check this yourself, using Adobe documentation:
First you need to determine whether Adobe has 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.
Camera Raw plug-in | Supported cameras
Camera Raw-compatible Adobe applications
Since 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 then open.
Photoshop Help | Digital Negative (DNG)
The DNG converter does work, but if you want maximum quality from your new camera's raw files (not to mention the convenience and ease of use of directly opening your raw files) you may want to consider upgrading to the latest version of Photoshop. Adobe has made substantial improvements in raw conversion quality in recent years.
-Noel
