Before anything else, please make sure to check your spam / junk folders, as registration key e-mails do sometimes mistakenly end up there instead of your inbox. If your pledge was via our Kickstarter campaign or through one of our first wave Paypal bundles and you have not received your registration key yet, please contact us via support. Make sure to include your Kickstarter connected e-mail address or the Paypal Unique Transaction ID listed on your Paypal receipt so we can find your records and look into things for you. If you purchased Early Access through the Humble Bundle Store and you have not received your key, you can request a key re-send via this page: