First, go to your device's Settings. Download the APK you want to install and click on the notification to start the installation. You'll need to give permission for the browser to install the APK. To do this, go to the settings that appear on the screen and follow the instructions.
It's important to revoke permissions after installing a third-party application, so that additional applications are not installed without your knowledge. If you're installing an app from a trusted developer that isn't in the app store, you might want to do so. Sites like APKMirror should be reliable enough for this purpose.
You can also find an alternative APK for an AAB application file by using an APK download site instead. However, it's important to be aware that incomplete APK files can contain malware, as many who thought they were receiving the first versions of Fortnite for Android discovered with dismay.
If your Android device doesn't have access to the Google Play Store, APK files may be your only option for installing apps on your device. You can use Google Play Store to install apps and games, or you can cancel the pre-order and install the APKs yourself.
Installing APK support on your device is easy when you know how. With this guide, you'll be able to do it in no time.