Finally the engineers have release the message :
Rekordbox 5.4.1 is fully compatible with the latest version of OSX : Mojave.
It seems that 5.4 worked fine, but now it's officially supported when you update rekordbox to the latest version.
5.4.1 gives under the hood a bunch of updates and optimalisations, but the biggest one is support or Mojave.
Finally you can enjoy the new Dark Mode in OSX
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