So I tried downloading another app [Lucky's Tale] which was listed at 2.25Gb and I've hit the same issue and just like with Lone Echo which was listed as 13.72Gb when you go to resume its lists as 18.78Gb Lucky's tale is also exhibiting this behaviour by resuming at 8.06Gb. Now I'm no expert but that has nothing to do with windows fire wall or folder location...
The only time I have this issue is when there isn’t enough HD space. A game will need more space to install it then what it actually takes up. Not only that but if it’s an update it will download it in conjunction to the one that’s already there requiring almost twice as much space.
CPU: Intel i7-5820k @3.30GHz,
Graphics Card: Nvidia Geforce GTX1080,
RAM: 16GB DDR5,
Viewed on: Oculus Rift or 28" BenQ monitor (x2),
Hard Drive: 240GB OCZ SSD (games), 128GB Samsung SSD (OS), 64GB SSD (3d),
OS: Win 10 64 bit