You can also just install the free Kindle app on your phone or tablet as well, and that counts as a registered device.
But I bypass using Kindle for PC entirely now. When I purchase a book I select Kindle for PC, but then download it directly under "Accounts & Lists". Select "Content and Devices" (it's under "Digital Content and Devices"). That page is your entire list of all book purchases. Click the button under Actions with the ... and select "Download & transfer via USB" and it will download the .azw3 (or .azw on a few titles, I've run into that with short story compilations) version directly to your computer, letting you select the directory you want to download to. Then you can remove DRM and convert it to whatever format you want in Calibre.
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