it’s possible to generate stems using audio interface Traktor Scratch Audio 6??because it doesn’t show to me when i press te secundary trackpad botton on my MacBook Pro ?
It's a software capability, nothing to do with audio interfaces. Just make sure you click on the audio file from within a playlist, not from the explorer node / OS folder; NI has mentioned in the release notes that this is a temporary limitation with the current version only.
I personally consider TP4.02 a public beta version regarding the two newest features, flexible grids and stem generation.