I am a user of Roon and HoloAudio RED. I use an iPhone, and since only Roon Remote 1.8 is supported on iOS, I downgraded Roon ROCK to version 1.8 for compatibility.
I have two network players: the Cambridge Audio EVO150 is recognized properly by Roon ROCK, but although the HoloAudio RED appears in the device list, I can’t select it because of a version mismatch.
If I upgrade to Roon 2.0, the Roon Remote won’t work on my iPhone.