Color me clueless. I got a notice from Amazon, that Unseen Realm was updated, with the update so overwhelming, your notes would become unattached, etc. I don't do notes in resources. Okie dokie.
So, I updated. Best I can see, it looks the same; 2015. And the Amazon version is the old 2015 version. And the Lexham site looks old too.
So, if you've the Kindle version, don't bite.
Separately:
The Amazon update system is a disaster. Olivetree and Accordance better. Logos, almost best (I don't like forced updates). Both Amazon and Apple both have revenue un-enhancing resource support disasters. Apple still has trouble with its wishlists after so many years.
Logos is just too good.