Long gone are the days of manually downloading and installing game mods, all thanks to the various mod managers, like Nexus’ Vortex. How Do I Download and Install Fallout 4 Mods? The two most common methods are via Nexus Mods and Bethesda’s workshop, where they feature various game modifications brought to you by content creators worldwide. When it comes to installing Fallout 4 mods, you have a few options.