Universal Rig Adapter for Maya

Fit rigged joint skeleton to mesh that has been modified, or scaled, with the weights transferred to new one.

Run from script editor or save to shelf. You can save the py script anywhere, it's not path dependant.

Click on the corresponding buttons after having selected the objects in the scene, the currently rigged object is Original Mesh, the scaled or modified model is New Mesh, and the root joint is the primary joint of the skeleton.

Get here
https://github.com/revoconner/Universal-Rig-Adapter/

commercial use
https://www.artstation.com/marketplace/p/lJ93Y/universal-rig-adaptor-for-maya