Sometimes downloading an application from PlayStore is not an option( e.g. no internet ) then you should have your offline backup of your favorite applications. The best tool for me in doing this is Clean Master. It will extract the .apk files from the installed application for storage.
- Download Clean Master from PlayStore.
- Head to 'Application manager' and select the application you want to extract the .apk file.
for the example above freedom sms apk file will be extracted. The default location of the extracted apk file will be on your phone storage under the directory <your phone storage>/cleanmaster/backup.