[BUG] CoWork fails to start on macOS — checksum mismatch downloading claude-code-vm 2.1.111 (linux-arm64)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] 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

strings ~/Library/Logs/Claude/main.log | grep -i "ClaudeCodeManager-VM" | tail -20

resulting in

[ClaudeCodeManager-VM] Downloaded file size: 57547432 bytes, transferred bytes: 15678291 bytes (expected: 51815821)
[ClaudeCodeManager-VM] Checksum mismatch: expected=a6830c44..., actual=751002b0...

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" />