Here are the steps to download the Plants vs Zombies 1.3.16 SD files:
/storage/emulated/0/Android/data/
Save files are located in:
Later versions (2.0 and above) introduced in-app purchases for coins, power-ups, and extra seeds. Version 1.3.16 is the last pure "premium" build—you pay once (or in this case, install once) and enjoy everything. Plants vs Zombies 1.3.16 sd files -Android-.zip
or (if using an external SD card)