How to Fix Overlay Permission error on Android version 6.0 HD

When you install the apk file, have you ever troubled by the inability to press the button? This app can unlock the button which security was caused by "Screen Overlay". Set-up 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 https://play.google.com/store/apps/details?id=jp.sfapps.alertwindowchecker Unlocked Button List The unlocked button list is shown below. Users can also be added. ・INSTALL button It will be displayed when you install the app from the apk file. ・Vpn button（Android 4.3 or lator） It will be displayed when you want to allow the VPN. ・Accessibility button（Android 5.0 or lator） It will be displayed when you activate the accessibility features. ・ALLOW button（Android 6.0） It will be displayed when the app requests the permission of the authority. It is also effective for permission buttons on the "App permissions" screen in the settings. ・START NOW button（Android 6.0 or lator） It will be displayed when you allow the screen capture. ・ACTIVATE button（Android 6.0 or lator） It will be displayed when you activate device administrator.