5.5.2 is working 100% fine. Problem was that TrackIr was starting as "run as administrator", and as Arma neither Battleye were being run as such, TiR software was being blocked. Solution: run everything as admin or everything as user. Also, Battleye isn't trying to block the software anymore.
Last time I checked, this was the status:
5.5.0 works on all games, but TIRMouse is broken. (I'm running this version now)
5.5.1 doesn't work on several games, complete mess. (should be removed from downloads)
5.5.2 corrects TIRMouse and some cosmetics, but is blocked by Battleye (i.e., doesn't work inside Arma series, for example)
I don't want to mess my install again just to test it, so I would like to know if devs sent the 5.5.2 "software signature" to Battleye so they can be aware of the new version now?