I believe the megapatch v10.1m will allow an upgrade from any game version of Il2-1946, from 4.08m upwards, without having to go through individual patch installs.
When you run the megapatch it should ask you which directory to intall into. Point it to your IL2-1946 root directory of the 4.09m install (backup the install first). Everything else should be automatic. Don't know if the steam thing is mucking things up?
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