[BUG] Failed to start Claude's workspace version 2.1.92

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?

Claude Desktop (macOS) fails to start the Cowork workspace after the latest update with the error:

"Failed to start Claude's workspace. Download failed. Check your internet connection and try again."

The app is requesting SDK version 2.1.92, but that binary does not exist on Anthropic's servers — it returns a 404.

What Should Happen?

The 2.1.92 SDK binary should exist at the expected GCS path, or the app should fall back to the installed 2.1.87 binary.

Error Messages/Logs

curl -I "https://storage.googleapis.com/claude-cli-prod/claude-code-vm/darwin/arm64/2.1.92/claude"

HTTP/2 404
content-type: application/xml; charset=UTF-8
date: Thu, 09 Apr 2026 15:47:07 GMT

The 2.1.87 binary is present locally and verified, but the app refuses to use it and keeps trying to download 2.1.92:

~/Library/Application Support/Claude/claude-code-vm/2.1.87/  ← has 'claude' binary + .verified
~/Library/Application Support/Claude/claude-code-vm/2.1.92/  ← empty, download fails every time

Steps to Reproduce

1. Update Claude Desktop to latest version on macOS (arm64)
2. Open Claude Desktop
3. Open Cowork workspace
4. Observe "Download failed" error
5. Confirm with: curl -I "https://storage.googleapis.com/claude-cli-prod/claude-code-vm/darwin/arm64/2.1.92/claude" → 404

Expected Behavior

The 2.1.92 SDK binary should exist at the expected GCS path, or the app should fall back to the installed 2.1.87 binary.

Environment

• Platform: macOS (darwin, arm64)
• Claude Desktop: latest (requesting sdk 2.1.92)
• Previously working SDK: 2.1.87
• Disk space: sufficient (72GB free)
• Network: confirmed reachable (storage.googleapis.com returns 200 for valid paths)

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.87

Claude Code Version

2.1.92

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

The binary does download (~108MB) but is immediately deleted by the app,
likely failing verification. The 2.1.87 binary is 228MB — 2.1.92 appears
truncated/corrupt on the server. Download timestamp: Apr 9 12:15