You put this folder in your MODS folder.

C:\Ubisoft\IL-2 Sturmovik 1946 HSFX 7.0.1\MODS\AutoDiffFM_HSFX701_Expert-Normal_Mode

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Credits: I have created this AutoDiffFM based in  the original, thanks to who ever did it, to thanks to the changes in the code by chrisgibon.

Saludos.

ton.