You can find a faulty/crashing mod by using the least amount of launches. Here are the detailed steps: Save your current mod profiles of XCOM by clicking on profile > save Right-click the header of the first column to filter the mods according to the enabled status of mods. Disable the mods and relaunch the game one by one. If the game still crashes, then the faulty mod is still enabled. Repeat the search process until you find the faulty mod.