v1.6.1 is the current version:
- Steam Library -> RPG Maker MZ -> right-click -> Properties -> Betas -> None.
You can check the editor version via Help -> About from the editor's menu bar.
MZ 1.6.1 uses the same core scripts as v1.6.0. The only difference is that it uses NWJS v0.49.4 rather than v0.69.1 for playtest and Windows/Mac deployment.