As far as anyone can tell, it would be up to A&K to provide an ARC version that isn’t ancient like the 1.0.40 that they offer. 1.0.40 is from July 2023 and it simply can’t work with a current Roon server version. And even if it did, nobody would want to use it because ARC has improved a lot since then.
What’s unclear is why A&K don’t do this or if somehow they need help from RoonLabs. You can find the existing topic here: