[BUG] Unable to install Claude Cowork plugin on PC's. Affecting all PC user

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?

Hi all, my colleagues are seeing the attached error message when attempting to install the Claude Cowork plugin on their PC's. Please see the attached error.

Also, please see the attached log file from my colleague, Shivani.

<img width="845" height="485" alt="Image" src="https://github.com/user-attachments/assets/306e1f69-f146-4ab2-9ec7-1128efae3a2d" />

What Should Happen?

Claude Cowork should open after the add in is installed.

Error Messages/Logs

See attached

Steps to Reproduce

We've tried to install the Claude Cowork plugin multiple times with no success.

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Currently not being used

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

N/A