Game crashes when using custom mode

I am a single player with custom mode, not multiplayer, but after this DLC update of Lords of the West, the game crashes when I use the custom mode.

If this continues, I cannot play the game. I have been dissatisfied with the existing Tech Tree, so I only played in the custom mode, but are you telling me not to play?

I’m not interested in anything like achieving achievements. For me, that’s just annoying. What’s wrong with trying to play quietly on my own without harming multiplayer? Producers, didn’t you also make a mod-making function?