The is a critical update for the PC version of the original Call of Duty: Modern Warfare 3 (2011). It serves as both a gameplay balance update from the developers and a foundational requirement for the TeknoMW3 client, which enables dedicated servers, LAN play, and a modified multiplayer experience. Overview of Patch 1.4.382
For those interested in a more comprehensive look at the changes, here are some of the detailed patch notes: teknomw3 1.4.382 patch