PLEASE HELP!! How do you install a large app/game on the SD card on kit kat? lg optimas L70?

[alware]

I have the LG L70 running KitKat and. So I got 750mb free storage space, and while I can move an app to the SD card after install, incl. the main app of gangstar vegas, but when I run it and it tries to download the 1722MB data package, it obviously says not enough space on the device internal storage. Which is true, but I have the darn SD card inside, how do I get the phone to download the data there? im rooted aswell if that helps is there an app that can cake the phone think my external memory is my internal memory? thanks in advance