Summary: XCode components (eg. iOS Simulator Runtime, tvOS Simulator Runtime, predictive code completion model) fail to download / install. I have tried to self-service this issue as much as possible before posting. Description of Problem: In XCode, I am unable to install predictive code completion model. The attempts fail with error Failed - There was an error transferring over the network. and details: The operation couldn’t be completed. (IDELanguageModelKit.IDEModelDownloadAdapter.(unknown context at $11c762764).DownloadError error 2.) Domain: IDELanguageModelKit.IDEModelDownloadAdapter.(unknown context at $11c762764).DownloadError Code: 2 User Info: { DVTErrorCreationDateKey = "2025-02-27 16:12:31 +0000"; } -- There was an error transferring over the network. Domain: IDELanguageModelKit.IDEModelDownloadAdapter.(unknown context at $11c762764).DownloadError Code: 2 -- System Information macOS Version 15.3.1 (Build 24D70) Xcode 16.3 (23748.10) (Build 16E5104o) Timestamp: 2025-02-27T08:12:31-08:00 The simulator runtimes fail with this, different, error Failed - download failed and details: Download failed. Domain: DVTDownloadableErrorDomain Code: 41 User Info: { DVTErrorCreationDateKey = "2025-02-27 16:27:04 +0000"; } -- Download failed. Domain: DVTDownloadableErrorDomain Code: 41 -- Failed fetching catalog for assetType (com.apple.MobileAsset.iOSSimulatorRuntime), serverParameters ({ RequestedBuild = 22E5200m; }) Domain: DVTDownloadsUtilitiesErrorDomain Code: -1 -- Download failed due to not being able to connect to the host. (Catalog download for com.apple.MobileAsset.iOSSimulatorRuntime) Domain: com.apple.MobileAssetError.Download Code: 60 User Info: { checkNetwork = 1; } -- System Information macOS Version 15.3.1 (Build 24D70) Xcode 16.3 (23748.10) (Build 16E5104o) Timestamp: 2025-02-27T08:27:04-08:00 These specific error details are from the newest XCode-Beta, but the same issue persists with XCode. Troubleshooting already performed: I have tried uninstalling + reinstalling XCode and XCode-beta several times. I have tried deleting ~/Libraries/Developer multiple times I believe I am logged into XCode and OSX with my developer Apple account. Not sure how to verify if XCode is using this account during the download attempt. I have tried reinstalling OSX. Previously it was stuck at 15.0.0, but reinstalling got the newest minor+revision version to 15.3.1. I have followed the manual steps: https://developer.apple.com/documentation/xcode/downloading-and-installing-additional-xcode-components I am able to manually download the components components from Apple Developer Downloads: https://developer.apple.com/download/all/ (The download works and is quick, so I don't believe this is a network issue) There is PLENTY of drive space available (eg. 100s of GBs) As this is a laptop, I tried disabling energy saving mode. It is running on AC power. Additional Relevant facts: Very strangely, I was able to download an iPhone 16e supplemental component Network adapter: WiFi. Internet connection: Comcast / XFinity cable DNS resolver: tried using default for my network and tried switching to other public DNS including 1.1.1.1, 8.8.8.8 I tried looking in Settings > Privacy and Settings, Settings > Network for app-specific permissions / firewall settings, but I don't believe any are applied. I'm not running sudo when I start up XCode.