Downloaded with Antivirus disabled, now it works, thanks!

I've got the original game working ok (but not updated to 1.04 version). I'm not sure whether my antivirus messed up something, I will try to disable it and download the DLC again, I'll let you know, thanks.

I bought the 1939 campaign (downloadable version), succefully downloaded the exe file named "PanzerCorpsWehrmacht_GC39_DLC1.exe" but whne I launch the executable I got the following error message (translated from my home language, hopefully it is understandable): FIle version is not comapt...