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There are several in the Amazon Appstore, but I’ve been using ES File Manager. The APK files can be emailed to the device, and downloaded from the native email client, then installed from any file manager. Those without another Android device might consider asking around on forums for users to extract the files for them. Anyone with an Android phone can download an app from the Android Market and extract the installation package, known as the APK, using apps like Astro File Explorer. This can be a risky proposition as malware is more common in this kind of gray market space. Some Android apps can be obtained from their developer’s site, or from various alternative repositories online. Under Device, there is a toggle to allow the installation of apps from “Unknown Sources.” That needs to be set to “On.” Once the device is ready to go, you need to find the apps.
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To install apps from outside Amazon’s ecosystem, one need only to take a quick trip into the settings.
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