When you install the apk file, have you ever troubled by the inability to press the button?
This app will unlock automatically the locked button and it can also unlock the locked button other than the install button.
Please set up by the following procedure.
1. Turn on the switch on top-right corner in the screen of the "Install Button Unlocker".
2. Accessibility screen is opened. Please select the "Install Button Unlocker" item from the list.
3. Turn on the switch on the top-right corner.
4. "Use Install Button Unlocker?" dialog is displayed. Then choose OK button.
In Android 5.0 or later, an error may occur.
If an error occurs, install the "Alert Window Checker" from below, please stop the app that inhibit the activation.
Alert Window Checker