You don't name an AI traffic file so generally speaking "AI Traffic downloads" usually come in the form of BGL files and just need placing into Addon Scenery Folder.

To decompile the AI_traffic.bgl one needs TTools v.202

To be more specific, if the AI flightplans fly between airports with requisite parking and the requisite aircraft are installed on your system (with the requisite correct numbering) the AI traffic d/l should work.

Bill
P.S. Here's what the three (3) decompiled files may look like: