By default, Android disables APK installations for security reasons. To download the APK file of the Custom Android app, you will have to enable APK installations on your device. Follow the instructions specific for your device version and phone brand below:

Android 8 or above

Samsung devices

1. On your device, tap Settings > Apps.
2. At the top-right, tap .
3. Tap Special access > Install unknown apps.
4. Tap the browser from where you will download the APK, such as Chrome.
5. If prompted, toggle Allow from this source on.

Non-Samsung devices

1. On your device, go to Settings.
2. Tap Apps & notifications > Advanced.
3. Tap Special app access.
4. Tap Install unknown apps.
5. Tap the browser from where you will download the APK, such as Chrome.
6. If prompted, toggle Allow from this source on.

Android 7 or below

1. On your device, tap Settings.
2. Tap Security.
3. Under Device administration, toggle Unknown sources on.