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Okay. The graphics are now ok on my first machine sfter running some regular system updates and updating itch. I don't know what did the trick.?????

Huh, how weird.  Well, I'm really glad you managed to resolve the problems, even if it is a mystery as to what caused them in the first place.  I'm sorry you had to go through all that though.  I hope you enjoy the game enough that it was worth it!  At the very least you know you should be able to run other games made with Unity without the same issues.