Your smartphone settings may prevent you from installing apks that haven't been downloaded from the Google Play store. Please try changing the settings using the methods below.
* Android 8.0 or above
- Open File Manger, and select the APK file you want to install.
- If it displays [For your security, your phone is not allowed to install apps from unknown sources], tap [Settings].
- Enable the [Install from Unknown Sources] option.
- If you can install the file, a confirmation screen will appear. Click the Install button to complete the installation.
* Android 7.1 or earlier.
- Open File Manger, and select the APK file you want to install.
- If it displays [Install Blocked], tap [Settings]
- When Security settings open, tap "Install Unknown Apps" to switch it on.
- Return to the File Manager, and select the APK file you want to install again. If you can install the file, a confirmation screen will appear. Click the Install button to complete the installation.
A file manager is required to open downloaded files. If you do not have such an application, please install one of your choosing.