Follow these instructions precisely. If you skip a step (like extracting the zip file), the game will fail to load.
Move or Copy this folder to: Internal Storage / Android / obb / 5. Launch the Game
Note: The OBB is sometimes packaged as a .zip file. If so, extract it. You need the .obb file, not the zip.
This is the most common point of failure. The OBB file must go into a specific folder. Do not put it in Downloads or Documents .