This makes it easier to fix any potential issues. *Whichever option you choose, it’s best to run your game after you install every individual mod to make sure that everything works, or at least after every couple of mods. Overall, we’d recommend using manual installation, but here’s a breakdown of the available options. There are 3 ways to install Witcher 3 mods: Also, make sure you have some free space available (ideally, 10 GB or more). Summing Up How to Install Witcher 3 Modsīefore you start modding Witcher 3, we recommend making sure your graphics and any other Windows drivers are up to date.