It was calways there, in your DBW. Possibly not all improvements work at once.
But to my knowledge that was deal with the original too. Some people saw the difference,
others complained pages long that they don't see any difference. You can trace it by playing two times the same Mission
and analyze AI behaviour, not focussing on your plane etc. Then you see marginal differences (random) behaviour.
As Malone said, this version of AI Mod is 409 comp only.
Hit delete or use at own risk, this version is superceded by newer Files in your DBW.
A quick file search will let you see that all are included in XTD/DBW Base,
with 3 out of 4 superceded by latest compatible version of SAS AI_Engine_HotKeys_Carriers as well.
A quick Test showed I was able to load this, needs more testing to see.
Anyway, hope I could help you a bit