In July 2015, Adobe made a pivotal announcement: ACR 9.1.1 would be the terminal version for CS6 users. While the software continued to evolve for Creative Cloud subscribers, CS6 owners were essentially "frozen in time" with the camera and lens support available in that specific release. Key Milestone Highlights: How to update camera raw PS CS6 - Adobe Community
Shut down Photoshop, Bridge, and Lightroom completely. The installer will fail if any Adobe process is running in the background. adobe camera raw 911 download verified