The easiest way to change Fortnite’s installation directory is to uninstall it and simply choose a different location when reinstalling it through the Epic Games launcher. If you’re in a rush or just have slow internet, though, there is a way to move the files that you’ve already installed. Here’s how:
Navigate to your current installation directory (likely C:GamesEpic GamesFortnite if you’re on a Windows PC).
Copy everything here into a new folder and name it something like “Fortnite – backup”.
Open the Epic Launcher, click the gear icon next to the game’s launch button, and select Remove.
Begin installing the game in your desired location, but stop it after a minute or so.
Go to your new installation directory, delete the Fortnite folder and replace it with “Fortnite – backup” (or whatever you named it earlier).
Rename your backup folder “Fortnite”, without the quotation marks.