I managed to solve it (finaly!!!!):
> accessed this link to be able to choose the version of the Media Feature Pack depending on my Windows version > https://support.microsoft.com/en-us/topic/media-feature-pack-list-for-windows-n-editions-c1c6fffa-d052-8338-7a79-a4bb980a700a
> Selected: Start, then selected Settings > Apps > Apps and Features > Optional features > Add a feature. Searched for the Media Feature Pack in the list of available optional features > instaled it
> Reinstalled Rekordbox
> Voilà
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