Restore the lost menu button from Android. root is not required.
You can regain the function of the application whose menu cannot be displayed.
The "Home, Back, Recent Apps" button is useful when a physical button fails.

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.