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## What changed - Make the shell and PowerShell installers download release metadata and assets from `releases.openai.com` by default, with bounded request timeouts. - Fall back to GitHub Releases when metadata is unusable, required assets are missing, or downloaded assets fail checksum or manifest validation. - Document `CODEX_INSTALLER_USE_RELEASES_OPENAI_COM=false` for opting out of the default release source. ## Testing - Cover default-source installation, malformed and incomplete metadata, version mismatches, corrupt assets, invalid checksums, incomplete manifests, and GitHub fallback failures in the shell installer tests. GitOrigin-RevId: 1c65d527ca79761358c3a4cd7a5fd675e1ef75b2