[EJGr.Ost_Caspar]

There was an issue with different DLL, if I remember correctly. Try this:

Before you install 4.09m, save following files from 4.08m (can be found in main game folder):

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

After installing 4.09m copy these files back into the mainfolder and overwrite existing ones.

Tell us pls, if it worked or not.


EDIT: BTW... did you usually need the DVD to be inserted to start the game?