Sorry I was testing in an old project with an old runtime.
So is ok to use this plugin or is there an official solution?
And now that I updated the runtime, I have this error:
error CS1061: Type Spine.SkeletonData' does not contain a definition for
AddSkin' and no extension method AddSkin' of type
Spine.SkeletonData' could be found (are you missing a using directive or an assembly reference?
How do you add a skin to the skeletonData now?