Lightroom does not use the Camera Raw plug-in that Photoshop uses.
Lightroom uses the Camera Raw code that is built into Lightroom.
If you have a new camera that needs a newer version of ACR, your choices are:
- Upgrade LR to a newer version that supports your new camera,
- Download a newer version of the DNG converter, convert your raw files to DNG, import the DNG files into the old version of LR.