Thank you for looking into this and for the link.
I read the article, but I am afraid there is nothing I can do.
My computer is almost ten years old.
Running the game as an administrator was exactly the first thing I did, before sending a comment here.
My graphics card is Intel(R) HD Graphics 4600 and Intel Driver Assistant claims everything is up to date, so I guess that means no updates anymore.
I will not touch the registry unless I know exactly what to edit, which I have no clue about.
I run out of things to try.
I guess I am not going to play the game in the foreseeable future.