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".