Rule of thumb for modding LWOTC (and XCOM 2 in general).It is a much better resource than the default launcher. Check out the Alternative Mod Launcher and stay updated by joining the discord.ONLY RUN THE VERSION WHICH COMES IN THE LWOTC INSTALL ZIP. YOU DO NOT NEED, AND IN FACT SHOULDN´T, INSTALL THE WORKSHOP VERSION OF THE COMMUNITY HIGHLANDER.However, modding will nearly always require adjustments on the user end, and that means YOU. LWOTC is as-is pretty much a stable build (dev 25 at the time of writing).
If an LW2 mod is not listed as compatible it is safe to assume that it will not work. There is no point in listing all of them as incompatible so we'll focus on the the ones that work. If you won´t read anything else, READ THIS: This is a community-maintained list of mods and how they interact with Long War of the Chosen.