Improve your vehicle and cross challenging tracks, experience drift physics, improve your parking skills, and get ready to race. Thanks to the open world map, you will be in control.
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Make sure that third-party apps are allowed on your device: go to Menu->Settings->Security-> and check "Unknown Sources"

Tap the APK file. Allow the app any required permissions it asks for. Then, at the bottom of the installer window, click INSTALL.

You'll see a confirmation the app is installed. Now you'll see the app available in your list of installed apps.