Guix,

‘Download latest images’[0] points to [1], which returns a JSON:

> {"error":"Could not find the request build product."}

There are plenty[2] to choose from.

Kind regards,

T G-R

[0]: http://guix.gnu.org/download/latest/
[1]: 
https://ci.guix.gnu.org/search/latest/ISO-9660?query=spec:guix-master+status:success+system:x86_64-linux+iso9660-image
[2]: https://ci.guix.gnu.org/search?query=iso9660