On Mac OS X, you can run the screen saver only in "test" mode from the System Preferences Screen Saver (or Effects) panel. Use the "Test" button on that panel to try out MA as a screen saver. You must purchase a keycode to use the screen saver in regular usage (eliminate the blank screen with the message).
Similarly, you must purchase a keycode (i.e., purchase the product) to have access to the starfish and the lionfish. Additionally, purchasing the product allows you to view up to seven fish (eight fish for widescreen displays) instead of three, as in the demo.
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