We send you a license key in your email receipt when your purchase of SlideDeck 2 is processed, but sometimes the key can not be generated quickly enough, or you need to retrieve the key at a later date. Here's how you can do that:
Visit: http://www.slidedeck.com/my-account/ and log in if necessary.
Click the SlideDeck 2 tile and the dark area should open like a drawer:
Your license keys should be displayed next to the purchase amount and the license name. You can also get your invoices from this area.