It also increased the game's install size above 200 GB.
When the update was first teased, focusing on the 200 player battle royale mode, many fans made jokes under the original Tweet about how the 200 would actually mean the amount of gigabytes of space the update will consume. I'm sure they're all wishing they had kept their prophetic mouths shut right about now.
Note that these reported sizes are from players who own Modern Warfare, and have both games installed simultaneously. F2P Warzone players are reporting an install size of slightly over 100 GB. The update's download size was around the 30 GB mark, however it shouldn't have added that much to the install size due to Infinity Ward's compression efforts.
Call of Duty: Modern Warfare and Warzone have been struggling with huge storage requirements since the very beginning, and the developers have begun trying to address this with the last patch, which replaced many assets with compressed versions to keep file sizes in check.
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It seems something went wrong when deploying today's update, which meant that the new download didn't ultimately replace old assets, but simply added to the overall install size. On console, players can choose to install and uninstall bits and pieces of the game modularly, however this simple quality of life option isn't present on PC - where it really ought to be.
Activision and Infinity Ward will need to find a way to rein in the game's install size or risk losing players. Many who are drawn to the commitment-free benefits of a free-to-play game won't go out of their way to purchase additional storage if these file sizes keep ballooning, and a game breaking the 200 GB mark rightly irks paying players too.
We'll see if Infinity Ward addresses this issue in the coming days.