Got it!Copy your redemption code from the El Capitan download link.Open the App Store and make sure that you're signed in with your Developer Program Apple ID.On the Featured page, under Quick Links (on the right hand side of the page), click on Redeem.Insert your code and click Redeem. If it tells you that it's unavailable, just keep clicking (rapid fire style). This worked for me and OS X 10.11 is downloading now.
Topic:
App & System Services
SubTopic:
Core OS
Tags: