FL's plugin search there's a Kontakt_2, and after some file searching i found an old version of Kontakt (6.1.1) sitting in a subfolder in my VST directory. Not entirely sure how I've missed that, but everything ...
FL twice in the last week and the last one was the 20.5 version which I think is the last one.
The version before that would give me a notice that the project I was about to open was created ...