I have an older Mac Book Pro El Capitan I would like to use as a back up How do i register it as it fails on native access.
Heyo!
I will suggest you to check this article out!
https://support.native-instruments.com/hc/en-us/articles/209544789--Installing-Native-Instruments-Products-on-a-New-Computer
Also since you will be using an older OSX, please contact support so they can provide you with a compatible version of Native Access for your computer.
https://bit.ly/NI_support_Traktor