I am a customer that bought the game a few months ago. There is a link where they said that they are offering a refund [in case you were not part of the people who bought the other versions to get the beta access, too].
You just need to show your bill info you get after you buy the game to the email they provided in that page [You know the info you get your email, date, hours, and the amount it charged your CC], and you can then buy the $45 or $60 version.
I bought the $60 version [the one that have the fanbook + the beta access]. Just go to the main homepage of this game and when you click the buy $29.99 or more, type $45 or $60 [the fanbook will be released in the release date] and you will have access to both beta access version [mac and win]