Your iMac is already running legacy Roon 1.8 because of OS incompatibility, so you need to move your core to this version, too.
The downloads are under the heading, “Download Links for Roon Core 1.8 (Legacy)”. If your core is on a Nucleus or ROCK, the steps are different and described in the following section.
yes I got there n the end now have roon on my desktop working nicely with my roon server except when Mac studio *core audio is selected as my end point I cannot get my AirPods to work I posted similar the other night but that was on iPhone (which is now working great ) so nearly there with this unfortunately my naim atom doesn’t live with me in my study the naim works brilliantly and sounds brilliant too
Since this thread is marked as solved, further comments are likely to be missed–I’m signing off for the evening now. Therefore, start a new post in Support if you’re unable to sort this yourself.