It was a while ago, and I'm a noob when it comes to Android, but I'm pretty sure I downloaded it to my computer for free from one of the alternate sites here
https://www.mobileread.com/forums/sho...=157520&page=2
as an APK file then sideloaded and installed on my fire...I'll try to remember which site and get back to you if someone doesn't beat me to it.