Verify latest release

• I verified that the issue exists in the latest pnpm release

pnpm version

No response

Which area(s) of pnpm are affected? (leave empty if unsure)

CLI

Link to the code that reproduces this issue or a replay of the bug

No response

Reproduction steps

1. Configure a custom npm registry
2. Make sure that the global and local pnpm versions mismatch
3. Block network access to https://registry.npmjs.org
4. Run pnpm install

Describe the Bug

The pnpm self update downloads pnpm from the npm registry, even if a custom registry has been configured.
I noticed this while npm was down due to a cloudflare outage.

There was an attempt to fix this issue with #10205 but the changes have been reverted.

Expected Behavior

The pnpm self update uses the registry that has been configured in the system.

Which Node.js version are you using?

24.11.1

Which operating systems have you used?

• macOS
• Windows
• Linux

If your OS is a Linux based, which one it is? (Include the version if relevant)

No response