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Godot 4.3 dev 2 is a dev snapshot for the 4.3 feature release. Dev snapshots are in-development builds of the engine provided for early testing and feature evaluation while the engine is still being worked on.
https://github.com/godotengine/godot-builds/releases/tag/4.3-dev2
Keep in mind that while we try to make sure each dev snapshot is stable enough for general testing, this is by definition a pre-release piece of software. Be sure to make frequent backups, or use a version control system such as Git, to preserve your projects in a case of corruption or data loss.
https://godotengine.org/article/dev-snapshot-godot-4-3-dev-2/