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You can use your Android's mobile browser, or use a desktop internet browser on a computer. Type https://apps.evozi.com/apk-downloader into the address bar, and hit ↵ Enter or ⏎ Return on your keyboard. Alternatively, you can use a different APK downloader website. A quick Google search will provide you with a wide selection of third-party APK downloaders. Hold down or right-click the text field, and select Paste to paste the app link you've copied from the Play Store. This will find the app you want to download, and generate a new download link for an APK file. You can find this button below the blue Generate Download Link option. It will instantly download the selected app's APK file to your phone, tablet or computer.

Summary:
Open your internet browser. Go to the Evozi APK Downloader page in your browser. Paste the app's Google Play URL in the box at the top. Tap or click the blue Generate Download Link button. Tap or click the green Click here to download button.