Sometimes, not every Android app will be available on the Google Play Store in your region, which means you'll need to install the APK file instead.

Installing an older version of an Android app will often mean you need to download the APK file from a third-party source.

Android devices have the ability to "sideload" applications that aren't available on the Google Play store. Here's how you can do it.

Want to try downloading and installing apps on your Kindle Fire aside from the ones that Amazon offers? Follow these steps to add Google's Android Market.