The Flintstones is an American animated sitcom produced by Hanna-Barbera for ABC. The series takes place in a romanticized Stone Age setting, and follows the activities of the titular family, the Flintstones, and their next-door neighbors, the Rubbles (who are their best friends). It was originally broadcast from September 30, 1960 until April 1, 1966, in a prime time slot, the first such instance for an animated series. The continuing popularity of The Flintstones rested heavily on its juxtaposition of modern everyday concerns in the Stone Age setting.  The Flintstones was the most financially successful and longest running network animated franchise for three decades, until The Simpsons debuted in late 1989. In 2013, TV Guide ranked The Flintstones the second greatest TV cartoon of all time(after The Simpsons).
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To install apps that are not from the Google Play Store; Android requires you to enable the (Unknown Sources Setting).
To enable the Unknown Sources setting:
Go to your Home screen and tap Settings. Select Security. You may need to scroll down to see the Unknown Sources setting, enable this setting then try installing the application again. For Android 8.0+, tap Settings, then tap Apps. Next search for the app you just downloaded and enable it to be installed. If you still have problems try searching online for how to turn on >>> (Enable Unknown Sources) for Android.