In order to make your copy of Fallout 4 mod-friendly, you need to edit two configuration files, Fallout4. Copying these files will ensure that, in the event of a catastrophic failure on your part or if you just want to start from a clean installyou don't have to download and re-install the game. In the case of Fallout 4, these are found by default in. The first step to modding any game is to make a backup of all of your games files, including any loose configuration files. If you're playing on console, here's how to install mods on Xbox One. There are two main methods of installing mods : manually or via a program such as the Nexus Mod Manager. This page contains instructions on how to install mods on the PC version of Fallout 4.