Try these solutions if Lightroom Classic version 15.3 or earlier displays an error when you apply Denoise.
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Adobe Camera Raw version 18.4 introduces updated Denoise models. Due to a known issue, Lightroom Classic 15.3 and earlier may load these models from the Camera Raw installation rather than the Denoise models included with Lightroom Classic.
This creates a version mismatch between the expected and loaded Denoise models, leading to unexpected errors. As a result, when you try to apply the Denoise option from the Develop module, the Denoise Errors dialog box appears.
Denoise model version mismatch
Update your Lightroom Classic app to version 15.4 or later, or revert Camera Raw to version 18.3 or earlier. To check the version number of the Lightroom Classic app, launch the app, and then select Help > About Lightroom Classic (Windows) or Lightroom Classic > About Lightroom Classic (macOS).
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