Thanks but I have already tried that and it did not work.
Do you get any error message after you download the above updater and run the installer?
Yes, the error message said that it wasn’t suitable for my system. I have tried quite a few updates and nothing seems to work - the camera raw file is in the correct place according to the Adobe site.
I even installed photoshop 5.1 but to no avail. I have a photoshop elements on this computer - for my daughter to use - and that has no problems recognising raw files.
Nothing I do seems to rectify the problem.
After I did a clean install of Yosemite on my Mac the raw files from my Nikon also could not be read from my CS5 apps. I needed the Camera Raw update but, the Camera Raw update wouldn't install. The installer kept failing.
So, here's what I did.
1. Open one of your CS5 app. I opened my Bridge in this case. Go to help, click Update. After a while it'll show you all the updates you need to install. Take a screenshot of this, write them down or whatever you normally do.
2. Go to Adobe website and download the updates files one by one taking note of the version number it suggests you should have.
3. Make sure all your CS5 apps are closed. This is important. If not, it won't tell you to close them but simply fail.
4. Install the updates one by one. Install Camera Raw update last (maybe not necessarily last, but that's what I did). During install OS X will tell you it won't play with you because the installation file is not certified. Now, proceed at your own risk. Be certain you just downloaded the right update files from Adobe and not some third party site that might have contaminated the files. There's a risk even if you download direct from Adobe because the files are not signed (certified). I can't guarantee that for you, so proceed at your own risk. To proceed, right click on the installation file and click open to install. If it won't do it, do it again. And again. It installed for me.
All is well that ends well.... thank God.