Ready Player Me Avatar VR XR Demo - 36 compile problems. I got the Final IK

I have used RPM in the past for Facial animation and Multi-player for Photon PUN2. I am trying to do the RPM Avatar XR Demo. Got the project. Added the Final IK for $90. Went to the correct scene and got 36 errors. It some errors when starting up about the Core package - Xcode … . Is this product supported anymore? If it is not - any one recommend something comparable? Thanks.