Re: Failure getting compat on Emacs <29. seq.2.24 signature expired in gnu elpa?

[Pierre Rouleau]

On Mon, Jun 3, 2024 at 12:59 AM Stefan Monnier via Users list for the GNU
Emacs text editor <help-gnu-emacs@gnu.org> wrote:

>
> The simplest is likely to install the `gnu-elpa-keyring-update` package,
> but you may have to either disable signature checking temporarily,
> or manually extent the lifetime of the 2019 key.
>
Thanks for the info Stephan,

On that older system with Emacs 26.3 where the failure occurs,
I  tried to install the `gnu-elpa`keyring-update` package but that failed.
I tried with `package-check-signature'  set to allow-unsigned and
also tried with it set to nil.  In both case it failed with the following
message:

 Contacting host: elpa.gnu.org:443

Install package ‘gnu-elpa-keyring-update-2022.12’? (y or n) y
Contacting host: elpa.gnu.org:443
package-install-from-archive:
https://elpa.gnu.org/packages/gnu-elpa-keyring-update-2022.12.tar: Not found

How would I extend the lifetime of the 2019 key?
This occurs on an old system, kept old on purpose for testing,
a macOS Mojave system where installing software is often a challenge.

If all else fail, I have other systems where all is fine and have downloaded
the package.  Could I just copy the files and install it manually?
Aside from copying the files inside the ~/.emacs.d/elpa directory, what
else must be done?

-- 
/Pierre