Ensure your image is in RGB mode (Image > Mode > RGB Color).
In some situations—for example, if the automatic installer fails—you may need to download a specific older version of Camera Raw manually. Adobe maintains an archive of older releases for exactly this purpose. camera raw filter download for photoshop cc 2019
Guide: Installing Camera Raw Filter for Photoshop CC 2019 Ensure your image is in RGB mode (Image > Mode > RGB Color)