This information applies to latest version
DxO PhotoLab 8 ELITE Edition users already have access to DeepPRIME denoising technologies, so purchasing the additional software is not necessary.
However, batch processing with the option to shuffle the order of images and priority within a batch and custom naming conventions to each batch of images for faster identification later in your workflow are strong arguments for purchasing DxO PureRAW 4.
For users of DxO PhotoLab ESSENTIAL Edition, DxO PureRAW will allow you to use the newest DxO Labs denoising algorithm, but it may be more beneficial to you to just upgrade in your customer account to DxO PhotoLab 8 ELITE Edition.