Not sure why they started the what practice, but you can see the download link in the website repo: https://github.com/radicle-dev/radicle.xyz/pull/145/files#di...

Specifically: mac https://releases.radicle.xyz/radicle-upstream-0.1.4.dmg Linux https://releases.radicle.xyz/radicle-upstream-0.1.4.AppImage

Release bucket listing https://releases.radicle.xyz/