Clearly I'm having a senior moment..how does one get a key?
Make sure you have an IndieGala account. Then, go the link mentioned above (https://www.indiegala.com/store#giveaway
). There, you 'll see a banner at the top part of the page. Click X, then click the red "Claim Free Copy" button, solve the captcha (if necessary) and the gift code should be added to your IndieGala bundle library.