My JME is missing a class and I dont know why

I just noticed today that the class jme3tools.optimise.TextureAtlas is missing in my version of jme.

I have all the other classes in the package, such as GeometryBatchFactory, but not this one.

Im on the stable release channel so I thought that may be the issue here, does anyone know?

Should I just download the class and stick it in the folder?

Thanks :3

Its in the latest stable release, did you update to that? Help->Check for Updates