Already done ... that's why I ask here - I have no clue what still could be wrong. New DCS World installation, modules downloaded and installed, game started. Some activation dialogues popped up (FC3, Huey, Mi8), some didn't (A-10C, Ka50 2, and P-51D). Those modules don't work now, the others do. I have activated P-51D, Ka50 and A10 manually by starting the xx_protect.exe from their directories; they appear in the list of installed modules, but I can't get into the aircrafts, just watch them flying (as if they weren't activated).
:cry: