This is actually a mod created by the makers of XCOM themselves, allowing you to experience the game in multiplayer mode To start off on this path, we have XCOM 2: Tactical Co-Op.
There's also a lot of mods when it comes to actually adding to the base game, or even changing the gameplay completely. Here we look into modding the game, from the use of NMM to the Steam Workshop.- Check Out Part 2! A. - XCOM 2, one of my favorite games of the last few years.Home XCOM 2 Vortex mods not working Vortex & XCOM 2 WOTC - Vortex Support - The Nexus Forum