Purchasing and licensing: bought from Apple

You have said that you have bought the Universalis app from the App Store.

If you want Universalis on the Kindle Fire

The best and most flexible way

A Universalis registration code gives you access on all the devices and systems we support: mobile devices, laptops and desktops.

Since you have already bought the Universalis app from Apple, you have already paid half the price of a Universalis registration code. If you now buy a registration code from us by paying the second half of the price, you will have full flexibility for the future because the code will work on Amazon devices, Android devices, Mac, Windows, and e-books.

Buy a Universalis registration code at half price – £9.99 (about $12.60 or €11.50) – using the Universalis app on your iPhone, iPad or iPod Touch. The instructions are here.
On your Kindle Fire, get Catholic Calendar from Amazon (it's free) and put your registration code into it. Instructions are here.

Note that to do this, you do still have to have an iPhone, iPad or iPod Touch device with the Universalis app that you bought from Apple.

The quickest way

Just buy the Universalis app from Amazon. The instructions are here.

You don’t lose any money doing it like this. But the app you get will work on Amazon devices only, so you do lose a little flexibility for the future.