Allow installing unknown apps

For security, Android blocks apps that don't come from the Play Store. You need to allow one app (Downloader, or your browser) to install apps.

On Google TV and Android TV

The path varies slightly by TV. The most common one:

1. Settings › System › About: select Android TV OS build 7 times to enable developer options (only if the next menu doesn't appear).
2. Settings › Apps › Security & restrictions › Unknown sources.
3. Turn on Downloader.

On a phone or tablet

Open the APK: Android shows a “For your security…” message. Tap Settings, turn on Allow from this source, then go back to install.

This permission only applies to the chosen app. You can turn it off after installing.