STEP 1: Download the APK and place it in your Phone of choice.
Usually it appears in your phone's Download folder.
If you download it via Computer, copy the .apk file into your phone via USB or Bluetooth.
If you want to use an emulator, just use that emulator's own APK installing functionality.
STEP 2: Back up your Game Files (IMPORTANT)
WARNING: If you are planning to UPDATE your game and want to BACKUP your save files, follow instructions here first. https://herculion.zendesk.com/hc/en-us/articles/900002567103-How-do-I-backup-my-game-files-on-Android-
Reinstalling the game will delete all your save files. Back them up to restore them.
STEP 3: Run the APK file on your Android phone.
When prompted, choose to install it.
If you're using Play Protect (Google Play), it will block it. Choose "Install Anyway".
The app should install.
Enjoy the game!