I have in the folder "Program Files (x86) / Norton Internet Security / Engine" two folders "21.1.0.18" and "21.2.0.38" side by side - of the same size. GUI shows in About just older version "21.1.0.18". It looks like the newer version is silently installed, but actually the older version works. Isn't it strange? (Win 8.0 / 64)