What software update for Traktor 4 MK3 includes the current stem production functions?
Traktor Pro 4.0.2
4.0.2 UPDATE
What do you mean with Traktor 4 Mk3? Any version of Traktor Pro 4 (the software) contains the stem separation function. If you own a Kontrol S4 Mk3 (the hardware) you can use this controller with Traktor Pro 4. But if you own it already for some time Traktor Pro 4 is a paid upgrade as this controller came with Traktor Pro 3 till July. If you buy it new today it contains a licence of Traktor Pro 4.