Adobe designed ACR 9.1.1 specifically for the 2015 release of Creative Cloud. If you are using a perpetual license of Photoshop CC 2015, this is the maximum version your software will support. Attempting to install ACR 10.x or later will fail.
While it remains a powerful, stable raw converter for legacy workflows, it is a solution for modern photographers. Before installing, verify your host software version and operating system. Always download directly from Adobe’s servers to avoid malware. If you need to edit raw files from a modern mirrorless camera, invest in a Creative Cloud update or use the DNG Converter workaround. Camera Raw 9.1.1 Download