GPK File
STEP 1 - Download & install software following software [one time only]
https://docs.google.com/file/d/0B6PSlLvu0tGsVWpxaS10Wm9LVHM/edit?usp=sharing
STEP 2 - Download Your application or game in gpk format ( you will find some of the files on this site in gpk format)
STEP 3 - Copy gpk file on your mobile SD card or phone memory .
STEP 4 - Download & install "any File Manager" from play store .
STEP 5 - Navigate to gpk file through File Manager, select .gpk file - select open as - text -; select the software you installed just now !
STEP 6 - hit YES , and it will install automatically to your device . (if your device does not support ***** language or if you see boxes , don't worry about it , just choose yes and that's it ! ENJOY !
Other Method
1.With file manager (i use UltraExplorer v2.0 APK), rename gpk to ZIP or RAR
2. Extract and you will have now apk file and folder data
3. Instal apk first then put data on 'Android/data/here' or 'Android/obb/here'
4. Enjoy
Main Website http://bit.ly/1o1omlj