8GB NOT 13.4 GB
+1, 8GB install.
Result, 13.4 GB will be okay.
Let me show you logically with some maths.
You got 13.4 GB left, GTA takes up 8 GB.
Well, by the maths, it seems that you have enough memory for V!
And you'll still have some left so you can download freely a couple of porn movies!
Up to you man, and I hope I helped!