You have said that you have bought the Universalis app from the Amazon Appstore.
The Universalis programs on the Mac and Windows are free to download and they work for a trial period without requiring payment. After that, they need a registration code.
Since you have already bought the Universalis app from the Amazon Appstore, you have already paid half the price of a Universalis registration code. So you can now buy a registration code by paying the second half of the price. The code you buy will work on Android devices, Apple devices, Mac, Windows, and e-books.
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