Version numbers on 4K77 aren’t iterations, they’re variations. In other words, 1.6 is NOT considered to be the latest and greatest, just a different “branch” following a different color correction approach. 1.4 is also a branch which is just as current in its own way, just with different color correction. The biggest difference between any of these versions is typically the colors.
It takes a little getting used to. In other projects and software, higher numbers are always the version to get, superseding previous versions. Not so with 4Kxx. Although major version changes (i.e. 2.0) may indicate something worth forgetting about previous versions for.
It’s anarchy, sheer anarchy 😉