Beamer 1 is no longer for sale.
Beamer 2 requires OS X 10.9 (Mavericks) or newer and can be download via http://beamer-app.com
If you already purchased a license for Beamer 1 but lost it, you can recover it.
If you already have a license for Beamer 1, you can download Beamer 1.7.9 here.
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