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`_download_manifest` and its `_require_https` helper parsed the catalog entry's `download_url` with an unguarded `urlparse(url)`. A malformed authority — e.g. an unclosed IPv6 bracket like `https://[::1` — makes `urlparse` (or `.hostname` on older Pythons) raise a raw `ValueError`. The three `bundle` CLI commands (`info`, `install`, `update`) only catch `BundlerError`, so that `ValueError` escaped as an uncaught traceback. Wrap both parse sites in the same `try/except ValueError -> BundlerError` guard already used by the sibling `_validate_remote_url` (and established by the merged catalog-URL fix #3576), so a bad `download_url` reports a clean, actionable error in every mode. Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>