Unable to Download Runtimes

[rehannali]

I'm unable to download Xcode runtime with version 26.0 and 26.1 using CLI.

Command:

xcodes runtimes install "iOS 26.1" --aria2 "$(which aria2c)"

I have also tried without aria2 and ends up with this error.

Downloading Runtime iOS 26.1: 0%
Error: ProcessExecutionError()

It worked if I used iOS 18.x.

Xcodes Version: 1.6.2
Xcode: 26.0.1

➜  xcode-select -p
/Applications/Xcode-26.0.1.app/Contents/Developer

[dfed]

I believe this is because -architectureVariant isn't being set here:

xcodes/Sources/XcodesKit/RuntimeInstaller.swift

Lines 296 to 300 in 93bce87

	process.arguments = [
	"-downloadPlatform",
	"\(platform)",
	"-buildVersion",
	"\(version)"

[rehannali]

Neither it shows architecture in list nor it includes in arguments.

[vineet-amipara-scaletech]

Getting the same error....
I updated the latest Mac os Tahoe 26.0.1

Downloaded the latest Xcode - 26.0.1 but not able to install the simulator

I tried to reinstall as well... Downloaded from appstore, external but still not able to resolve the issue..

Download Failed. Downloadable: {
architectures = (
arm64,
"x86_64"
);
authentication = none;
category = simulator;
contentType = cryptexDiskImage;
dictionaryVersion = 2;
downloadMethod = mobileAsset;
fileSize = 10066610754;
identifier = "com.apple.dmg.iPhoneSimulatorSDK26_0_1";
isInternalContent = 0;
isUserInitiated = 1;
name = "iOS 26.0.1 Universal Simulator (23A8464)";
patchableFrom = (
);
platform = "com.apple.platform.iphoneos";
simulatorVersion = {
buildUpdate = 23A8464;
version = "26.0.1";
};
version = "26.0.1.0";
}. Download failed.

[TomikeKrasnay]

It looks like that fix could be this commit: 93bce87
However, it hasn't been released yet

[rehannali]

That hasn't been fixed with that commit, or I have missed something which hasn't been mentioned yet. I have manually installed the including commit: 93bce87.

Updated Command:
xcodes runtimes install "iOS 26.0.1 arm64|x86_64" --aria2 "$(which aria2c)"
OR
xcodes runtimes install "iOS 26.0.1 arm64" --aria2 "$(which aria2c)"

ERROR:

Downloading Runtime iOS 26.0.1 arm64|x86_64: 0%
Error: ProcessExecutionError()

OR

Downloading Runtime iOS 26.0.1 arm64: 0%
Error: ProcessExecutionError()

[ThePredators]

Getting the same error.... I updated the latest Mac os Tahoe 26.0.1

Downloaded the latest Xcode - 26.0.1 but not able to install the simulator

I tried to reinstall as well... Downloaded from appstore, external but still not able to resolve the issue..

Download Failed. Downloadable: { architectures = ( arm64, "x86_64" ); authentication = none; category = simulator; contentType = cryptexDiskImage; dictionaryVersion = 2; downloadMethod = mobileAsset; fileSize = 10066610754; identifier = "com.apple.dmg.iPhoneSimulatorSDK26_0_1"; isInternalContent = 0; isUserInitiated = 1; name = "iOS 26.0.1 Universal Simulator (23A8464)"; patchableFrom = ( ); platform = "com.apple.platform.iphoneos"; simulatorVersion = { buildUpdate = 23A8464; version = "26.0.1"; }; version = "26.0.1.0"; }. Download failed.

I had same issue as you and managed to fix it check this : https://developer.apple.com/forums/thread/774890?answerId=864162022#864162022

[benniemosher]

When can we expect this to be released?

[baygazin]

this is still a problem

[rehannali]

this is still a problem

I believe releases are not maintained anymore. Compile the build yourself and replace it. Now you have fix for this error.

[Noobish1]

I believe this is because -architectureVariant isn't being set here:

xcodes/Sources/XcodesKit/RuntimeInstaller.swift

Lines 296 to 300 in 93bce87

process.arguments = [
"-downloadPlatform",
"(platform)",
"-buildVersion",
"(version)"

This is correct.

you can replace use of this xcodes command with:

xcodebuild -downloadPlatform <platform> -buildVersion <version> -architectureVariant arm64|universal

e.g.

xcodebuild -downloadPlatform iOS -buildVersion 26.3.1 -architectureVariant arm64
xcodebuild -downloadPlatform iOS -buildVersion 26.1 -architectureVariant universal

Note that -architectureVariant only works for buildVersion's above 26.0