[Gromic]

I had that problem with the upupdater recently myself. I shut down IL2 and wanted to do an update but the same thing happened to me. End of the matter was, my game hadn't shut down properly and the IL2FB.exe process was still running in the background. After killing it (through the process manager) the updater worked fine again.

One of those twighlight zone situations. Your issue is probably caused by something else but, you never know....