Troubleshoot installation and login changedtroubleshoot-install
Nearest release: v2.1.305, published under an hour after upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 20 Oct 2026 18:57 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 20 Oct 2026 19:07 UTC.
Upstream edited
Recorded here
Lines+23added
Lines−0removed
From line
27
where the diff opens
First seen
14 Aug 2026
this site's first read of the page
Recorded edits22to this page, all time
### Release verification failed for Claude Code ### `Auto-update failed · Run claude doctor` in the session footer
The whole hunk
from line 27, old and new numbered
/
from line 27
2727| `CRYPT_E_NO_REVOCATION_CHECK` or `CRYPT_E_REVOCATION_OFFLINE` | [Work around blocked revocation checks](#tls-or-ssl-connection-errors) |
2828| `Failed to fetch version` or can't reach download server | [Check network and proxy settings](#check-network-connectivity) |
2929| `The connection dropped while downloading the update` or `Download timed out: exceeded the total deadline` | [Run the update again or set your proxy](#the-connection-dropped-while-downloading-the-update) |
30| `Release verification failed for Claude Code` | [Run `claude update` or `claude install` again](#release-verification-failed) |
31| `Auto-update failed · Run claude doctor` in red in the session footer | [Run `claude update` from your shell](#auto-update-failed) |
3032| `irm is not recognized` or `The token '&&' is not a valid statement separator` | [Use the right command for your shell](#wrong-install-command-on-windows) |
3133| `Cask 'claude-code' is unavailable: No Cask with this name exists` | [Update Homebrew](#homebrew-cask-unavailable-or-outdated) |
3234| `Cask 'claude-code@latest' is not installed` | [Upgrade the cask you installed](#cask-is-not-installed) |
from line 628
626628* If your network requires a proxy, set `HTTPS_PROXY` before running the installer or `claude update`. See [Check network connectivity](#check-network-connectivity).
627629* If a corporate proxy keeps closing the transfer, ask your network team to allow the full download from `downloads.claude.ai`. See [Network access requirements](/docs/en/network-config#network-access-requirements).
628630* Run `claude doctor` from your shell for installation diagnostics
631
632### Release verification failed for Claude Code
633
634This message from `claude update` or `claude install` means Claude Code couldn't confirm that the release it was about to install is genuine, so it installed nothing. Any version you already have keeps working.
635
636```text theme={null}
637Release verification failed for Claude Code <version> (<reason>). The update was not installed.
638```
639
640Take the step that matches the value in parentheses in your message:
641
642* **A value that starts with `sidecar_fetch_`**: run the same command again from your shell. `claude update` succeeded if it prints a line that starts with `Successfully updated from`, and `claude install` succeeded if it prints `Claude Code successfully installed!`.
643* **Any other value**: try the same command again later
644
645With any value, if the message repeats, [report the problem](#still-stuck) and include the full message.
646
647### `Auto-update failed · Run claude doctor` in the session footer
648
649This red line means Claude Code tried to update itself in the background and the update didn't install. You can keep working without doing anything.
650
651The line points you to `claude doctor`, whose `Last update attempt: failed (install_failed)` line gives a date but no cause. To finish the update or see why it failed, run `claude update` in your shell instead. If that install fails too, look for the error `claude update` prints under [Find your error](#find-your-error).
629652
630653### Wrong install command on Windows
631654
No line in this hunk matches that.