If you've bought the Standard Edition and you now want to upgrade to the Special Edition in time for the alpha, here's what you need to do:
- Send $20 via paypal to firstname.lastname@example.org.
- E-mail email@example.com with your original purchase info (email, name &c.) and with the paypal transaction ID of your $20 upgrade.
That's it! Please remember that the Special Edition will no longer be available after the 26th of July, so you won't be able to upgrade beyond that point. Also, bear in mind that these upgrades are handled manually, so you shouldn't expect your upgrade to take place right away.