The game is a reboot of the Modern Warfare sub-series. It follows CIA officer Alex and Captain Price as they team up with freedom fighters in the fictional country of Urzikstan to stop a terrorist threat involving chemical weapons.
If you are looking for the narrative plot rather than the file size: cod mw 2019 highly compressed install
If you own the game legally on Battle.net, you don't need a shady repack. You can legitimately reduce the file size by 70% using official methods. The game is a reboot of the Modern Warfare sub-series