I am afraid you are out of luck with your camera as it is much newer than the CS4 software you are using. If you really want to use Camera Raw files then you have a few alternatives
1) Subscribe to Creative Cloud Photography Plan at $10/month
2) Buy a copy of Photoshop CS6 as it will recognise your camera, but at $999 it might be rather an expensive solution-and actually not advised
3) Use the free Adobe DNG converter. This will recognise the camera output and convert the raw files losslessly into digital negatives that Photoshop can open.
Adobe - Adobe Camera Raw and DNG Converter : For Windows https://helpx.adobe.com/camera-raw/kb/camera-raw-plug-supported-cameras.html
Adobe - Adobe Camera Raw and DNG Converter : For Macintosh