This information applies to all versions
DxO PureRAW does not work as a plug-in for DxO PhotoLab.
The recommended workflow when using DxO PhotoLab ESSENTIAL Edition (or any other compatible third-party software) is to import images to DxO PureRAW and process them there, and then export the resulting top-quality image files to DxO PhotoLab for post-processing.
However, we recommend upgrading to DxO PhotoLab ELITE Edtion instead of purchasing DxO PureRAW.