I've been working with an Amazon customer service representative the last few days, trying to get Amazon to push out the updated ebook to everyone who has already bought it. They were reluctant to do so as it would mean folks would lose their notes and highlights and such, which is fine and reasonable.
Instead, if you'd like, you can go to your 'Manage Your Kindle' page (or it might appear as 'Manage your Content and Devices'). Once you get there, there'll be a list of your ebooks. Any book that has an available update will display and orange 'update available button - including, of course, An Unclean Strength.
Once again, I'm very sorry for the typographical errors. Going forward I will be able to hire a proofreader as a backstop for my now less-than-sharp eyes.