As you can learn in the past year of popularity of ipad and Angry Birds. Nearly everyone install their own copy of Angry Birds in their device no matter iphone or ipad. And now, Angry Birds lauched in Android as well. This RIO version is the latest version of Angry Birds for Android. And more luckily, you can download it with Amazon Appstore(Another Android app ) for free!
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To get the free copy, you may need first download Amazon Appstore first with your device. And then access your amazon appstore with your account (Free to register as well ;p).

More info and steps to make it, you can see the official manual~

Click-by-Click Guide

You need to do this only once for each device. The clicks below should take less than 30 seconds.

Click 1

Open your device Settings and click “Applications”.

Click 2

If unchecked, click “Unknown sources”. If “Unknown sources” is already checked, skip to Click 4.

Note: AT&T Wireless does not support the Amazon Appstore for Android. See Help for more details.

Click 3

Click “OK” on the “Attention” dialog. “Unknown sources” will now have a green check.

Click 4

Open your notifications and click the e-mail message from Amazon Appstore.

Click 5

Click the link: http://www.amazon.com/gp/mas/get-appstore/android/ref=mas_em_dl?dl=1. The Amazon Appstore app will download to your device.

Click 6

Open your notifications and click “Amazon_Appstore.apk”.

Click 7

Click “Install”.

Click 8

Click “Open”.

That’s it!

Sign in with your Amazon.com account and start enjoying thousands of apps for Android.

You need to do this only once for each device.