If you bought a license for the screen saver through my website (NOT the Mac App Store), and you've lost it, you can contact FastSpring (my online store company) at the link below, and they'll be happy to take care of you.
For help with anything else, including trouble installing the screen saver or the license, contact me directly at email@example.com. This is the fastest way to get help.
Click here for FastSpring store support
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