How do i access Traktor pro 4 with my x1 mk3
Have you downloaded Native Access and entered your key?
https://support.native-instruments.com/hc/en-us/articles/13254747151901-How-to-Set-up-Traktor-X1-MK3
Yes but it only gives me access to Traktor 3
Have you bought your X1 Mk3 as new stock or used/second hand?
If new stock: Have you bought your X1 Mk3 before or after the release of Traktor Pro 4 in July?
If you bought it before the release of TP4: Buy the upgrade licence from NI. Traktor Pro 4 is a paid upgrade.
If you bought it after the release of TP4: Contact NI support, they have to sort it out. Go to NI website and log in with your account. Support → Product Support → Traktor → (scroll down to the bottom of that site) use chat in bottom right corner. You may need a proof of purchase date.
If second hand: I depends if the unit was sold before or after TP4 as new stock at first. But most likely you will have to buy the upgrade in that case.
If you bought it around or after the tp4 release, get in contact with support with proof of purchase.
https://support.native-instruments.com/hc/en-us/articles/360014498698-How-to-contact-NI-Support