gchiste - thank you! This resolved my issue. I think I need to learn more about why this was the design decision for a new AR project from the template.

This was automatically generated by Xcode 12.1 (no code was changed from the default template): import SwiftUI import RealityKit struct ContentView : View {   var body: some View {     return ARViewContainer().edgesIgnoringSafeArea(.all)   } } struct ARViewContainer: UIViewRepresentable {       func makeUIView(context: Context) -> ARView {           let arView = ARView(frame: .zero)           // Load the "Box" scene from the "Experience" Reality File     let boxAnchor = try! Experience.loadBox()           // Add the box anchor to the scene     arView.scene.anchors.append(boxAnchor)           return arView         }       func updateUIView(_ uiView: ARView, context: Context) {}     } #if DEBUG struct ContentView_Previews : PreviewProvider {   static var previews: some View {     ContentView()   } } #endif I have the App Store downloaded Xcode, not the version from the Developer downloads section. I have a screenshot that shows what it looks like on my device, but I apologize, I'm not sure how to link to imgur on the Developer Forums.

Same error here, on a 2019 16" MBP

I've been trying for a half hour, I keep getting "An error occurred while downloading the selected updates. Please check your internet connection and try again." I found this in the Console but am not sure if it is relevant: "The volume can not be used because it is not snapshot booted."