I've plugged in my laptop to my monitors. But getting the "The save file you have selected is protected to ensure that the assets in your mod folder have not been changed"
No Mods in my 'My Games' folder, so from this thread it seems like a Steam problem: https://steamcommunity.com/app/8800/discussions/0/540743757217626059/
I will uninstall the Steam version and install from disc. Otherwise need to plug in my (very) old pc each time.