February 6th, 2016, 17:00
its like Daniel says just run the game from the exe in the main game folder. I have a set of modified dialog files and common screen textures that puts period style menu buttons back into the game so you dont have to use the OFF manager part.
I've attached the files here for you to try, back up originals first. these will give you back the buttons on the start up screen to select QC, Missions and multiplayer. but not campaign mode.
the files also include the files to enable the same in game buttons if using the OFF manager. I did this so I didnt have to go back to the manager after every QC or mission.