You don't need an installation guide.
Just install 1946 and fly. You can force 1946 to use 4 cores (8 with i7) but as IL2 is 10 years old and never was optimized for multi-core/CPU you will get no big performance gain with this game.
Infact you may decrease playability by forcing 4/8 cores, because IL2 might start to stutter if you do so.
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