As of right now, this mod isn't able to be updated for next gen. In fact, as far as I know, no audio mod will be able to be updated for next gen until we have sound tools for changed formats. You can read more from the author of the sound tools from the post on their page.
Looks like mod author not going to make pass to NG version. Perhaps no interest in game anymore. At least to make a sticky post, so, people will stop asking for 4.04 version.
For anyone waiting for music, just play this in the background while you play. Its AMAZING witcher music. Search for it on youtube. Medieval Music - Medieval instrumental music,Relaxation Music
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the author of the sound tools from the post on their page.
Sound Tools Mod Page
Medieval Music - Medieval instrumental music,Relaxation Music