A corrupted preferences file. Solution:
Camera Raw 9.12.1 acts as a "cutoff" version for many older Adobe software suites. Photoshop CC : Compatible with Photoshop CC versions through CC 2017. Legacy Suites camera raw 9.12.1 download
Before downloading, ensure your software and hardware align with this version's limitations. A corrupted preferences file
If your version of Photoshop does not support ACR 9.12.1, you must use the free Adobe DNG Converter to transform your RAW files into a format your older software can recognize. How to Download and Install camera raw 9.12.1 download