The latest update fails with this error message:
I have added all the Couatl and Addon Manager .exe files and folders to my Microsoft Security Essentials excluded files and locations list, and I've changed the folder permissions to allow me full control.
I'm running FSX SP2 on Windows 7 Ultimate x64 if that helps.
I'm mystified as to what "being used by another process" could be, FSX isn't running and Microsoft Security Essentials should be ignoring that file?