If you purchase this "product" I will see the sale, and then within about 48 hours (less if you email me in advance) I will either add you directly as a purchaser of the appropriate Rebuilding Rails package or email you a 100%-off single-use coupon to the email address you purchased with. Basically: Gumroad doesn't have an easy way to do this, so I'll do it manually.
Depending when/how you purchased, it's possible to wind up with two copies -- the old package and the new package. Email me if this happens and you'd like me to remove you from the old one.
Within 48 hours, I will manually update your Rebuilding Rails product or send you a coupon for same