Windows ARM64 Dart SDK is missing for master channel (404 Not Found) #176603
Description
Steps to reproduce
On windows arm64, run on master channel (or any channel, actually):
flutter upgrade
Actual results
falling back to x64
404
dart-sdk-windows-arm64.zip no longer appears to be generated
Logs
Details
Trying to install/upgrade flutter on Windows arm64 fails with "falling back to x64"I tried this url this morning:
https://storage.googleapis.com/flutter_infra_release/flutter/898380a41c90a54dad599c582c9352490cd07b9d/dart-sdk-windows-arm64.zip
and this url just now:
https://storage.googleapis.com/flutter_infra_release/flutter/0499803cea9c614351e871032be38a5401316956/dart-sdk-windows-arm64.zip
they all return 404
flutter upgrade
Checking Dart SDK version...
Downloading Dart SDK from Flutter engine ...
The current channel's Dart SDK does not support Windows Arm64, falling back to Windows x64...
Expanding downloaded archive with PowerShell...
Building flutter tool...
Running pub upgrade...
Resolving dependencies... (3.5s)
Downloading packages...
Got dependencies.
Flutter is already up to date on channel master
Flutter 3.37.0-1.0.pre-434 • channel master • https://github.com/flutter/flutter.git
Framework • revision 5a6ba3c355 (3 hours ago) • 2025-10-06 20:46:19 +0100
Engine • hash e2ebfd9b3787d363a09917c1319626201879c938 (revision b48b3fe0c1) (3 hours ago) • 2025-10-06 18:30:46.000Z
Tools • Dart 3.10.0 (build 3.10.0-287.0.dev) • DevTools 2.50.0
Flutter Doctor output
Doctor output
<!-- Paste your output here -->
flutter doctor
Downloading package sky_engine... 732ms
Downloading package flutter_gpu... 97ms
Downloading flutter_patched_sdk tools... 299ms
Downloading flutter_patched_sdk_product tools... 251ms
Downloading windows-x64 tools... 1,084ms
Downloading windows-x64/font-subset tools... 245ms
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, 3.37.0-1.0.pre-434, on Microsoft Windows [Version 10.0.26220.6760], locale en-CA)
[✓] Windows Version (Windows 11 or higher, 25H2, 2009)
[✓] Android toolchain - develop for Android devices (Android SDK version 36.1.0)
[✓] Chrome - develop for the web
[✓] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.13.6)
[✓] Connected device (3 available)
[✓] Network resources
• No issues found!