It's a fresh installation on a complete new computer, and it IS the most recent version.
And I am sure I do something completely silly, namely I already use gruntmods edition.
I have windows 11, yes, and I find it way more stable and useable as windows 10, which I don't find stable and useful in any way.
But you are right, under windows 10 gruntmods 1.6.2 ran stable. But that is no argument, cause I cannot go back to 10, I need 11 for my work.
It works until a few situations come up. E.g. when I buy 2 mobile building vehicles (or how they are called in english, Idk, I have the german version). As soon as they get delivered, the game crashes. I can build them my own, that works.
I had a game save, just prior to the delivery. It crashed always in the samt situation when I reloaded the savegame. I took the few seconds, the vehicles where already ordered, the arrived and the game crashed.
Another issue is (also kind of same situation, but less specific), when a lot of computerplayers try to attack me at the same time.