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

Developer Tools & Services Xcode
JasonTran OP
Created 2d
Replies 17
Boosts 8
Views 770
Participants 14

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; }

Replies  17
Boosts  8
Views  770
Participants  14
Scionwest2 OP
1d

I have this issue too and have not been able to figure out how to fix it.

0
daniel.l OP
1d

I guess Apple broke the distribution server — there doesn’t seem to be anything we can do on our side as software engineers outside Apple. Let’s take a break and come up with an excuse for the managers, lol

0
lionelng OP
1d

I have the same issue on both my Macs, unable to download Build 23B86. Looks the build number has been bumped up.

Update: For now the only way is to download from terminal using Xcode command line tools

xcodebuild -downloadPlatform iOS -exportPath ~/Downloads

Then install it using terminal, the guide is at:

https://developer.apple.com/documentation/xcode/downloading-and-installing-additional-xcode-components#Download-Xcode-components-from-the-command-line

0
Kite-N-Shark OP
1d

I have the same issue. Xcode 26.1.1 (17B100). Tahoe 26.1. Cannot build my apps at all.

1
JohnLawn OP
1d

Having the same issue

0
stellus OP
1d

same here ....

0
Scionwest2 OP
1d

Even more annoying is that XCode 26.1.1 doesn't recognize any of my older platform installations. To work around this, I tried to boot and use an iOS 26.0 simulator still on my Mac but XCode refuses to acknowledge that it exists. Even if I use the Devices & Simulators window to create a new iOS 26.0 device, XCode will not let me use it without having iOS 26.1 downloaded first.

With all of the 26.1 beta issues with the simulators reported on these forums over the last 2 weeks, it's insane to me that this was still pushed out to production in such as broken state.

1
Scionwest2 OP
1d

Luckily going backwards isn't broken. I re-downloaded 26.0.1 from the developer portal and got back to working.

1
0tak2 OP
1d

I had the same error (exactly the same logs), but it was resolved after I completely shut down and restarted my Mac.

0
XiangPika OP
1d

same, is the server down?

0
Vursin OP
1d

I have the same issue but I can download ios 26.1 again after re-install the latest version of XCode from the AppStore.

0
daniel.l OP
1d

Looks like the issue has been fixed for now. I was able to download the simulator runtime using the following command:

xcodebuild -downloadPlatform iOS -exportPath ~/Downloads

and installed it with:

xcodebuild -importPlatform ~/Downloads/iphonesimulator_26.1_23B80.dmg
1
JackBob OP
1d

The command line xcodebuild -downloadPlatform iOS solved my problem.

1
lionelng OP
1d

But I noticed it was Build 23B80, it's the older build that had no wallpaper in the Simulator, just black wallpaper.

Earlier the failed download message said 23B86.

0
mibarret OP
1d

This worked for me. Download and install the "Command_Line_Tools_for_Xcode_26.1.dmg" Run Xcode and iOS 26.1 Runtime should now download properly.

1
Unable to download iOS 26.1 Simulator Runtime - Build 23B80 not available
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