I assure you that this is 100% valid method.
A powerful software for android will help for download the paid apps freely.
Blackmart is the software.
You will not find it to play store.In the below link you can download it free-
http://www.androidapksfree.com/apk/blackmart-alpha-free-download/
And one good news,you do Not need to Root your phone.No root needed.
Below video tutorial shows you all processes to download apps.
Too easy process,it will not take times for downloading.
Here is the detailed video
Thanks!Hope you are enjoying this video.