Treyarch thanked their optimization for the day one experience to allow a manageable download in todays AAA market.
"Before playing for the first time, players will need to download and install a day one update for Call of Duty: Black Ops 4".
Typically, day one updates for some titles are only around 12GB, but the upcoming Call of Duty: Black Ops 4 will more than quadruple that number with a massive 50GB day one update. This indicates that the day one update is replacing a large portion of game files, not adding to them.
The update is only applicable to the physical version of the military shooter, and is required in order to get your hands on the regular multiplayer mode, Zombies, and Specialist Headquarters.
Are you anxious about having to download 50GB for Black Ops 4, or does it not bother you? The notes mention that Blackout will be playable once the installation reaches around 30% on both consoles.
For a problem free install you need 112GB of free hard drive, although once it's finished the game will "only" take up around 55GB of space. In order to play Blackout before the full installation is complete, select "Update to Latest Version" when the prompt appears. If you've pre-ordered the digital version of the game then you'll be all set to go as the game will go live with the patch already included. Either way, you'll probably have a decent wait ahead of you before you hop into Call of Duty this year. BT Games and Game4U stores will have copies available from 6PM on Thursday, with BT Games expected to stay open until at least 8PM on Thursday.
Black Ops 4 officially releases on Friday, October 12 and the servers are expected to go live in the United Kingdom on Thursday afternoon.