This indicates that the day one update is replacing a large portion of game files, not adding to them.
Call of Duty: Black Ops 4 will be available on October 12th for the PS4, Xbox One, and PC.
Blackout, Call of Duty's new battle royale mode, will be playable once the download reaches about thirty percent completion, although you will most probably suffer from high ping and lag spikes if you play while downloading the rest of the game. Activision says that "for an optimized download experience", players will need at least 112GB of free space on their hard drives.
Red Dead Redemption II now holds the record with a massive 105GB install but Black Ops 4 has got nearly half that just for its day one patch - and the game won't work without it either. This update must be installed completely in order to access Multiplayer, Zombies, and Specialist Headquarters. That's not really a problem - and is now considered normal for most games, especially those with a multiplayer component. Shared earlier today, the post outlines the expected installation size on both systems, as well as the required space needed to install the game and its day one update. The patch itself will be approximately 50 GB.
The digital version clocks in at 55GB for the game and its patch on day one - and it also means you'll not need to switch out discs. To help counter this a little, Activision is allowing select retailers to start selling the physical versions of the game the day before release.
Black Ops 4 officially releases on Friday, October 12 and the servers are expected to go live in the United Kingdom on Thursday afternoon.