[8FS_Bulau]

There have been some issues with the 4.09m patch for some people, related to some .dll files:

il2_core.dll
il2_corep4.dll
mg_snd.dll
mg_snd_sse.dll

but usually it manifests as a 95% or 100% crash.

Saving those files from your 4.08m install, and replacing them after applying the 4.09m patch may fix it for you.
Worth a try.

Another possibility is that your 4.09m patch download is corrupt.