Lickba Unfortunately, 4.2 does not have a baking feature yet. For more information, see Nate's answer in the following thread:
https://esotericsoftware.com/forum/d/25169-baking-physics-and-looping
As he replied, we may be able to allow manual dropping of keys for the physics pose in 4.2, but to begin with, we do not recommend downgrading skeleton data created with a newer version to an older version editor. Even if this feature were implemented, it would not be possible to export the animation as is to the 3.8 format. Various changes have been made between 3.8 and 4.2, so if you export skeleton data in 3.8 format from 4.2, information about curves between keys will be lost and rotation behavior may not be correct.
If you would like to take advantage of the 4.2 features in your project, please upgrade both the editor and the version of the runtime you are using in your Unity project.
