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Taking an educated guess, it could be a permission issue, using the link you provided and removing the filename gets a directory listing in a browser, 403 is there when trying to download, other files are accessible.
Hopefully Andy will become aware of this, one option might be to access either the mailing lists, I'm banned due to comments on the origins of Code of Conducts and implementor, or GitHub.

When trying to install the update for 2.9.5 on a Raspberry Pi, I receive a security error when attempting to fetch The error is:

Forbidden
You don't have permission to access this resource.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.