The easiest way is to use AirDroid, if you don’t know what AirDroid is, don’t worry it is very easy to use and you will love it. Sign up here.

After you sign up go to the link above again and scroll down the page, you will see this;

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Simply sign in. Then you will see this;

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Just follow instructions on the picture and that’s it, you installed APK file into your mobile!