It's not really an update but a new release requiring a new install as far as I know.
Here's the latest (beta) download link from the owner. You'll need to have the email address you registered with to go through the install.

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http://clicks.aweber.com/y/ct/?l=AH9WC&m=1fRisdDK9SF2mD&b=4455_Uzj80ysYEjJzOVwWA