When I open "Treasures of the mystic Sea" on my PC it comes up with an Adobe flash player box asking to store on my computer. I cannot click in the box and therefore cannot play the game. I am operating Windows 10. Can you help?

When I open " Treasures of the Mystic Sea" on my PC it comes up with an Adobe Flash Player box asking to store on my computer. What does this mean and as I cannot click in the box I am unable to play the game I am operating Windows 10. can anybody help?