Hi, Steve. Welcome to the BestForAndroid forum!
First of all, location hack is possible and pretty reliable on Android but the Pokemon GO++ app you have mentioned is designed for iOS (iPhone) devices only. And for Android devices, there is a separate app i.e. Fly GPS. Which is the reason why you were unable to find the Pokemon GO++ apk file
As you are new to PoGo location hacking so it is important to let you know that both of these apps work similarly and will let you hack location with an on-screen joystick. However, since you are on Android device, you will be able to use Fly GPS to easily hack location in Pokemon GO.
I hope this helps you out. If you have any other question then feel free to ask