I finally got it right, that new update to KP2.
But strange, first I installed it over the older KP1 (which doesn't have free-standing program) also without the free-standing KP2-player. And this installation failed, that's to say that all occurences/instruments were blue/gray as if it wasn't found.
Next I did the installation again, yesterday, and now WITH free-standing KP2 and all GP-libs were now in full color, including the instruments.
Maybe a tip for others, but even so curious about the reason why this happened.