Here is the easiest method to download apk files on your PC / Mac. APK files are the android apps. It is a just extension like .exe for Windows app.
Steps to follow:
1. Go to Google Play Store.
2. Search any app.
3. Simply copy the id of desired app from Google play store (See method to find id of app in Video).
4. Go to http://downloader-apk.com.
5. Paste the id of app over there and click on Generate Download Link.
That's all, just download your desired app on PC / Mac.
Have any query, feel free to comment below....