I just purchased the game, after finishing installation it's says: "App appears invalid"?!
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That is so much information to go off of thank you, here is the solution to your problem. step one, what device are you playing on. step two, try multiple ways of installing. Step three, Don’t use a 3rd party app. Step four, if on ChromeBook Use the terminal to install. If all else fails, give up and go home, It just wasn’t meant to be.