The Linux AppImage of the newest release candidate or release, v2.2.0-rc.1, and its .zsync: the same files, here for AppImageUpdate, so that a release candidate's AppImage moves on to the next release candidate and to its version's release. This is not a version.
Download from v2.2.0-rc.1: its notes, the Windows setup and SHA256SUMS are there. For playing, use the latest release.