Originally Posted by
LocalHero1953
Adobe Camera Raw is ONLY available as part of a subscription, and not as a standalone option.
ACR is, I understand, more or less the same as Lightroom's Develop module.
Photoshop Elements is essentially an 8bit package; it can read 16bit image files but cannot handle layers in 16bit. So if you use PSE as your external editor within LR, unless you are only doing simple things you will be returned an 8bit file from PSE. Frankly, I've never tried to see if that makes a visible difference in the final image, but I don't like the idea of losing 16bit images so I tend to use PSE mainly for cloning and similar pixel-level editing.