The latest update / version installed. I am using this on a fanless windows 10Pro pc. Only Roon Server is installed here. This is then connected to the dCS Vivaldi DAC with a Shunyata Sigma USB (soon the Omega USB). With the first notes I immediately heard an improvement in openness and transparency. And I cannot say otherwise, without the Fidelizer software it certainly sounds a lot less. It also sounds better over the network in my office with a different computer. Roon Server is less affected by the Windows operating system. THANKS !!