I am playing Command: Modern Operations, the scenario Northern Fury 1: H Hour. Everything has been going fine for both auto saves & manual saves. After 19 successful manual saves & many successful autosaves, I got this message "Failed to perform Autosave! Error message: Object reference not set to ...

Just bought Command: Modern Operations via steam. I am stuck & can't do anything with the game. It downloads 99% of the file, then stops. It will not finish downloading. I thought maybe some file was corrupt etc, so I tried to uninstall the game so I can reinstall it. It won't allow me to uninstall ...