After the latest update Traktor Pro want startup. I don't have issues with other software like maschine or others. I tried reinstalling and repairing but neither did work.
How Can I Downgrade my TRAKTOR to an Earlier Version?
P.S. you didn't care to supply OS version but Traktor Pro V. 3.8 for PC is here
Otherwise then you have to ask N.I. Native Access and Installation Support (unless you want old legacy versions like 3.4 - 3.5 which we got links for in the forum also)
hangs at startup forever