There are several apps in the market that gives you free APK of the original paid App/Game but they are not 100% secure . They use to bundle up the Apk with the promotional APKs ( Apps/Game files ) and promote other apps .. They even edit the APKs and try to hack your Phone.

The best way to get the App from Google Play itself . No Hacks , No spam , No bundles , No ads .

Things you need : 

#1. An Internet plan with Good Speed ( Wi-Fi also works good ).
#2. Of course an Android Phone. :P
#3. A credit/Debit card ( with balance :P ).

Steps to be followed  ( Prerequisite )

#1. Go to Google Play ( Play Store ) on your Android device .
#2. Search for X-plore file manager ( It's my favourite ) and Download it , it's free :)  ( Direct link here )
#3. Open the X-plore file manager when downloaded  and select the Show button in the left panel .
#4. Tick on App manager .
#5. You are done ... with prerequisite.

Now move to Next steps to Download any Paid app for free . 

Note: First read all the steps and then only follow steps .

#1. Search for the app in play store you want to download and it's paid.
#2. Download the App followed by filling up the Credit/Debit card details.
#3. When the app is downloaded instantly go to the X-plore file manager and in the left panel select App manager .
#4. long press the app you've downloaded just now . and select Copy .
#5. Go to the Google Play and go to the app again and select the refund option .
#6. Agree the terms and conditions ... you'll be paid full amount you paid for the app.

Note : 
#1. your internet speed should be faster .
#2. Do all the steps as faster as possible because Google refund policy is for a limited time after you download the app Approx 15-20 minutes .

Screenshots that will help you :



There are others methods also . But we'll not promote them as they are related to other unofficial websites.