You might be visiting this page directed via a DuckDB error message, similar to:

INSTALL non_existing;

HTTP Error:
Failed to download extension "non_existing" at URL "http://extensions.duckdb.org/v1.4.0/osx_arm64/non_existing.duckdb_extension.gz" (HTTP 404)

Candidate extensions: "inet", "encodings", "core_functions", "sqlite_scanner", "postgres_scanner"
For more info, visit https://duckdb.org/docs/stable/extensions/troubleshooting?version=v1.4.0&platform=osx_arm64&extension=non_existing

There are multiple scenarios for which an extension might not be available in a given extension repository at a given time:

• the extension has not been uploaded yet, here some delay after a given release date might be expected. Consider checking the issues at duckdb/duckdb or duckdb/community-extensions, or creating one yourself.
• the extension is available, but in a different repository, try for example INSTALL name FROM core; or INSTALL name FROM community; or INSTALL name FROM core_nightly; (see the Installing Extensions page).
• networking issues, so extension exists at the endpoint but it's not reachable from your local DuckDB. Here you can try visiting the given URL via a browser directly pasting the link from the error message in the search bar.

If you are on a development version of DuckDB, that is any version for which PRAGMA version returns a library_version not starting with a v, then extensions might not be available anymore on the default extension repository.

When in doubt, consider raising an issue in duckdb/duckdb.

HTTP 451 Errors

An HTTP 451 (“Unavailable For Legal Reasons”) error when installing an extension means that the extension repository is not served to your location:

HTTP Error:
Failed to download extension "..." at URL "https://extensions.duckdb.org/..." (HTTP 451)

The default extension repository is distributed through a content delivery network that restricts access from certain regions for legal reasons, so the same INSTALL command can succeed from one network and fail from another. To work around this, you can:

• Connect from a network in a non-restricted region (for example, through a VPN).
• Download the extension manually from an allowed location and install it from the local file.
• Install from a different extension repository, such as a self-hosted mirror.

Manual Process to Download Extensions via the Browser

To check if an extension is available, consider trying to download the relevant extension resource, for example via your browser visiting https://extensions.duckdb.org/v1.4.4/osx_arm64/spatial.duckdb_extension.gz or any other link that has been provided. Note that http:// has been deprecated in favor of https://.

If successful, this will download and unpack the extension to the default Downloads folder, so that from SQL you can run:

INSTALL '~/Downloads/spatial.duckdb_extension';
-- or
FORCE INSTALL '~/Downloads/spatial.duckdb_extension';

and after this command the extension will be regularly installed.