I downloaded each patch, and ran the executable file, specifying that files were to be placed in the IL-2 1946 folder (I have an older version of the game still on my computer). I ran them in sequence ...
Just found this site (after finally burning out on Descent 3), I have downloaded and run all three patch (4.08, 4.09, 4.10), putting them in my IL-2 1946 folder, yet when I start my game it shows V4.0 ...