Unable to downloas Gears of War 4 on PC

Hi, everything is in the title.

i've always been a big big fan of GoW franchise but:

first things first, yes my pc is totally able to run GoW4 max settings 80FPS at least.

second I already downloaded it a couple of months ago, it ran great, I had to delete it due to a nice little bug that told me that my connexion status changed (which was totally fake) couldn't even launch the game anymore... I said nothing about the fact
that the charracter refused to move with "Z" but would go forward with any other key though but not being able to launch the game... that's problematic. i deleted it following an advice from... a "profesionnal" on this website.

third, except from my behemoth (talking about my pc), i got plenty of space... so yes, more than enough for 133 gigs.

fourth, YES i baught the game legally.

So is there anybody who could tell me what to do to re-install the game i payed "I-don't-know-how-much-for-but-it-was-expensive" or can i get my money back? cuz... if it doesn't work... ok, just patch the bug, those things happen. but i can't even install
it.

:)