I had the same defaults as strangeliu and deleting these made me able to download the MetalToolchain!

Removing these defaults worked for me! I had the same defaults as strangeliu

I had the same defaults as strangeliu. Deleting my defaults enabled me to download the Metal toolchain!

I had the same defaults as the post above. Deleting these defaults enabled me to download the Metal toolchain!

"EnableLiveAssetServerV2-com.apple.MobileAsset.MetalToolchain" = on; "PallasUrlOverrideV2-com.apple.MobileAsset.MetalToolchain" = "https://gdmf-staging-int.apple.com/v2/assets"; ProductName: macOS ProductVersion: 15.6 BuildVersion: 24G84