Unable to download iOS 26.1 Simulator Runtime - Build 23B80 not available

Developer Tools & Services Xcode

JasonTran OP

Created 2d

Replies 17

Boosts 8

Participants 14

Screenshot 2025-11-11 at 10.40.16.png Screenshot 2025-11-11 at 10.42.55.png

I am unable to download the iOS 26.1 Simulator Runtime through Xcode 26.1 on macOS 26.1 (Build 25B78). Issue Details:

When attempting to download via Xcode Settings → Platforms, the download fails with error code 41 (DVTDownloadableErrorDomain) and error code 60 (MADownloadCannotConnectToHost) The error message states: "Failed fetching catalog for assetType (com.apple.MobileAsset.iOSSimulatorRuntime), serverParameters ({RequestedBuild = 23B80;})" I receive HTTP 403 Forbidden when accessing mesu.apple.com/assets/

Steps Attempted:

Downloaded via Xcode Settings → Component → iOS 26.1 Simulator Tried command line: xcodebuild -downloadPlatform iOS Searched https://developer.apple.com/download/all/ - iOS 26.1 Simulator Runtime not listed Tested with different networks (home WiFi, VPN, mobile hotspot) Disabled proxy settings Flushed DNS cache

All attempts result in the same error. Important Notes:

Xcode 26.1 shows iOS Simulator SDK 26.1 (Build 23B77) is available However, Xcode attempts to download Build 23B80, which appears unavailable I experienced a similar issue previously with Xcode 16.4 requesting iOS 18.4 Simulator Runtime, which was also unavailable for download

Impact: Without the iOS 26.1 Simulator Runtime, I cannot develop or test iOS applications. macOS 26.1 requires Xcode 26.1, which in turn requires iOS 26.1 runtime, leaving me unable to perform any iOS development work. Questions:

Is iOS 26.1 Simulator Runtime (Build 23B80) officially released? Is there a direct download link available? Should Xcode 26.1 be requesting Build 23B77 instead of 23B80? Is there any account restriction preventing me from downloading newer simulator runtimes?

System Information:

macOS: 26.1 (Build 25B78) Xcode: 26.1 (Build 17B55)

Error description: Download failed. Domain: DVTDownloadableErrorDomain Code: 41 User Info: { DVTErrorCreationDateKey = "2025-11-10 15:38:07 +0000"; }

Download failed. Domain: DVTDownloadableErrorDomain Code: 41

Failed fetching catalog for assetType (com.apple.MobileAsset.iOSSimulatorRuntime), serverParameters ({ RequestedBuild = 23B80; }) 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; }

Boost

drewolbrich OP

Thank you to everyone who posted suggestions and workarounds.

jdhealy OP

Was able to xcodebuild -downloadPlatform iOS -buildVersion 23B86 -architectureVariant arm64 during a check twenty minutes ago*.

Started an iPad sim and did see (same as these folks) blue wallpaper rather than black, and no MercuryPosterExtension crashes..

This is after 9-ish hours ago, I got iOS 23B86 (arm64Only) is not available for download. output from the same xcodebuild -downloadPlatform command.

⋯ I assume during that 9-ish hours ago period, 23B86 was absent from https://devimages-cdn.apple.com/downloads/xcode/simulators/index2.dvtdownloadableindex but I didn't check at the time. There is a section for com.apple.dmg.iPhoneSimulatorSDK26_1_rru_arm64 now with «fileSize: 8321575375».

Glad to have it up and running now, thanks Xcode folks!

⧆ Previously, the machine under test had iphonesimulator 23B80 installed, and deleted via the Xcode 26.1 GUI prior to Xcode 26.1.1 being installed. The xcodebuild -downloadPlatform invocation for 23B86 was after sudo xcode-select -s /Applications/Xcode-26_1_1.app.