It looks like you downloaded Unraveled a while ago and have an old version of the offer BUT I have great news!
Unstoppable has been added into the KDP Unlimited program. This means that, according to Amazon terms and conditions, I am no longer personally allowed to give the book away for free... but, there are frequent Amazon secret FREE days and I will send you an email to alert you of those secret days so that you can download it at no cost to you.
Also - because you didn't get Unstoppable right away, I'm going to give you a FREE pre-publication version of the last book in the series "Uncharted" (also for free). So instead of getting one book for free, you get two.