an I upgrade Traktor pro V2.10.2.9 to Traktor pro V4? I want to install the A6 audio card and I can't find the traktor V3 anymore.
Depending on your hardware. If it is compatible with Traktor Pro 4: Yes, you can. But keep in mind that it is a paid upgrade. But Traktor Audio 6 should work with Traktor Pro 2 too.