OpenSuse Tumbleweed on PPC64

While trying to install the latest version of PPC64 OpenSuse Tumbleweed on my Powermac G5, I keep getting the error “http://download.opensuse.org/ports/ppc/tumbleweed/repo/oss/repodata/repomd.xml: Invalid Signature. Installation aborted.” The same error happens regardless of using the net installer or the local installer (where it complains about the local signature being invalid instead), and I cannot progress from this point.

I’d really like to try out OpenSuse on the G5 due to their seemingly decent support for modern(ish) AMD gpus.

Any help would be appreciated. Thanks