Pro tip if like many you are not able to download the game after pausing the crappy Windows store download
You have to download the entire 73.3Gb in 1 go without pausing it then its possible otherwise be prepared for frustration as it appears the Win 10 store does not currently have a working pause button due to MS utter lack of QA regarding their own store
I spent days trying to download & grabbed around 100Gb on several failed attempts where I paused the download then today left the PC on for 4.5 hours & it successfully downloaded all 73.3Gb in 1 attempt.
Good DRM from MS actually not letting many people even download the game they paid for
along with the Win 10 locked to 1 Xbox account DRM & the EFF file encryption DRM which unlocks on the fly as you play it (same DRM schemes used on the new Forza Win 10 game).
Game does look seriously good graphically though but screenshots do not do it justice you have to look closely at some of the PC in game videos released
Also if you bought the Ultimate edition of this game its unlocked for you on the 7th October 4 days before the release date for the other versions of the game!