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claude-code - 💡(How to fix) Fix [BUG] CoWork fails to start on macOS — checksum mismatch downloading claude-code-vm 2.1.111 (linux-arm64) [2 comments, 2 participants]

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anthropics/claude-code#49430•Fetched 2026-04-17 08:41:24
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Error Message

Observe "Download failed" error — repeatable on every launch

Error Messages/Logs

RAW_BUFFERClick to expand / collapse

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Environment Claude Desktop: 1.3036.0 (check via Help > About) macOS: your version (Apple Menu > About This Mac) Chip: Apple M4 Subscription: Enterprise

What's wrong CoWork fails with "Download failed" after auto-upgrading to SDK 2.1.111. The runtime binary downloads but fails checksum verification all 3 attempts, leaving ~/Library/Application Support/Claude/claude-code-vm/2.1.111/ empty.

Log evidence Expected size: 51,815,821 bytes, got: 57,547,432 bytes Expected checksum: a6830c443d1722c882b37c2901b022c3d23c34262de2213c9a5cbeb8391329ea Actual checksum: 751002b0b541dc122239498a2abcb201942d6ac049cc1906b8efd61815e94126 URL: https://downloads.claude.ai/claude-code-releases/2.1.111/linux-arm64/claude.zst

Steps to reproduce Claude Desktop auto-updates to SDK 2.1.111 Open CoWork tab Observe "Download failed" error — repeatable on every launch

Related: #49414 (same 2.1.111 release, different failure stage — binary installs but crashes; here binary never installs due to bad CDN artifact)

<img width="675" height="128" alt="Image" src="https://github.com/user-attachments/assets/0138ef43-b4a9-4e6f-bd04-f0dd4ae287f4" />

What Should Happen?

Claude CoWork should just open and be usable.

Error Messages/Logs

Steps to Reproduce

  1. Dowloand latest MAcOS binary from Claude website and try running a co-work session.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Claude 1.3036.0 (cf521c) 2026-04-16T16:17:33.000Z

Claude Code Version

2.1.81 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="675" height="128" alt="Image" src="https://github.com/user-attachments/assets/7319e084-230d-4e6a-a1af-4cfd9078d9a3" />

extent analysis

TL;DR

The most likely fix is to investigate and potentially update the CDN artifact for the Claude Code SDK 2.1.111 release, as the downloaded binary fails checksum verification.

Guidance

  • Verify the integrity of the downloaded binary by checking the checksum against the expected value to confirm the issue is indeed with the binary download.
  • Investigate the CDN artifact for the 2.1.111 release to determine if it's corrupted or incomplete, which could be causing the checksum verification failure.
  • Consider temporarily using a previous version of the SDK (e.g., 2.1.81) that is known to work, as a workaround until the issue with the 2.1.111 release is resolved.
  • Check for any similar issues reported for the same SDK version and platform (macOS, Apple M4 chip) to see if there are any known workarounds or fixes.

Example

No code snippet is provided as the issue seems related to a corrupted or incomplete binary download rather than a code issue.

Notes

The issue seems specific to the 2.1.111 release of the Claude Code SDK and might be related to a problem with the CDN artifact. The fact that a previous version (2.1.81) worked suggests a regression, and resolving this will likely involve addressing the issue with the 2.1.111 release.

Recommendation

Apply workaround: Use a previous version of the SDK (e.g., 2.1.81) until the issue with the 2.1.111 release is resolved, as it is confirmed to work and allows for continued use of CoWork while the problem is being addressed.

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claude-code - 💡(How to fix) Fix [BUG] CoWork fails to start on macOS — checksum mismatch downloading claude-code-vm 2.1.111 (linux-arm64) [2 comments, 2 participants]