Install from the sore the app "Downloader":
Step 1: Go to Settings.
Step 2: Select Devices.
Step 3: Go to Developer options.
Step 4: Turn on ADB Debugging and Apps from unknown sources
Step 5: Go to the Downloader app
Step 6: In URL put:
https://tv.aptoide.com
Step 7: Click on Install Aptoide TV button.
Step 8: Wait for the .Apk file to download.
Step 9: Scroll down and click Install.
Step 10: Now look for the Aptoide app icon and open it (The arrow is point at it)
Desde dentro de la app Aptoide Es como si fuera un "PlayStore".