Maybe have a try at our repo at archive.org (you can directly download, or use the torrent file) https://archive.org/details/openmandriva-lx-4.2-plasma-raspberry-4b
Just adding a comment, quoting a dev (@bero) about compression: “final version will be xz-ed, I've updated the write2sd script to handle it”
I also have issues downloading this file. For final version we'll have at least torrent files as alternative download.
Forwarding issue to QA team, thanks David