I have moved your post from the lounge to the Photoshop forum.
The Canon 5D Mk111 needs Adobe Camera Raw 7.1
That version of ACR is not compatible with CS5 (the latest CS5 can use is ACR6.7)
You have two choices:
1. Move to Photoshop CC which is compatible
2. Use the free DNG convertor to convert your RAW files to DNG then open those DNG files in your version of Photoshop
Digital Negative (DNG), Adobe DNG Converter | Adobe Photoshop CC
What operating system are you using?
Actually camera raw 6.7/6.7.1 for cs5 is compatible with the Canon 5D Mark III, so you probably just need to install the camera raw 6.7/6.7.1 plugin.
If you want the other photoshop cs5 updates install the newest adobe application manager and then try Help>Updates from within photoshop cs5
Camera Raw 6.7 Update
This new version of the Camera Raw plug-in replaces the original Camera Raw plug-in that was installed with Adobe® Creative Suite® 5, Adobe Photoshop® CS5.
Support for the following cameras has been added in this update. Visit the Camera Raw page for a complete list of supported cameras.
- Canon EOS 1D X
- Canon EOS 5D Mark III
- Canon PowerShot G1 X
- Canon PowerShot S100V
- Fuji FinePix F505EXR
- Fuji FinePix F605EXR
- Fuji FinePix F770EXR
- Fuji FinePix F775EXR
- Fuji FinePix HS30EXR
- Fuji FinePix HS33EXR
- Fuji FinePix X-S1
- Nikon D4
- Nikon D800
- Nikon D800E
- Olympus E-M5
- Pentax K-01
- Samsung NX20
- Samsung NX210
- Samsung NX1000
- Sony Alpha NEX-VG20
- Sony SLT-A57
Adobe decided to change the camera raw compatibility page to only list the newest versions of camera raw that support a camera.
You can read about the explanation here:
As you pointed out on that thread, it makes it very hard to advise users on the best route for compatibility if the page does not include the first support but only when full compatibility was given.
marshallh34614811 - Apologies for the false steer - it was based on the current published info
As suggested, I first installed the updated adobe application manager and then after that it took the RAW update, and now it works great! Thanks so much!!!