Yesterday I attempted at installing the new camera raw updates for Lightroom and Photoshop. I have fully licensed Lightroom 4 and Photoshop cs6 on windows 7 with recently installed , also fully licensed , Nik software plugins.
The Lightroom update was successful with ACR updated to Version 7.4 , while the Photoshop update, although, seemingly completed successfully, did not result in updating ACR, which remained in version 7.3. When I tried to use the update tool again in Photoshop I got a notice that the software is fully updated.
Thanks for your help
You may have multiple copies of the ACR plug-in installed. Use Help / About Plug-ins… and see how many Camera Raw entries there are, and click on each one in turn to determine what version(s).