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What causes nexus mod not working Fallout 4? After investigating many user reports and articles, we summarize the following possible causes behind the Fallout 4 issue. However, a lot of users encounter Fallout 4 mods not working when using Nexus Mode Manager on the game. Now, many mods for Fallout 4 has been available. Nexus Mod Manager is a free and open software that enables you to download, tweak, and save your games.