moving to camera raw forum
You are using the latest version of Camera Raw that is compatible with Photoshop CS5. Later versions of Camera Raw will not work. You have a few options.
1. Download and use the latest DNG converter (free from Adobe) to create DNG copies of your raw files that can be opened with what you have.
2. Subscribe to the creative cloud photography plan ($9.99/month) and always have the latest Photoshop, Camera Raw, and Lightroom.
3. Purchase Lightroom 6 (standalone version).
4. Use the ViewNX software that came with your camera to do your raw processing and save TIF files that can be opened using Photoshop.
Any of those solutions will provide you with access to the raw image data from your photos.