Go to the official Epic Games website
Download the Epic Games Launcher for PC
Open the downloaded installer and install the launcher
Sign in to your Epic Games account or create one
Open the Epic Games Launcher
Search for Fortnite in the Store or Library
Click Install
Choose the installation location if prompted
Wait for the download and installation to finish
Launch Fortnite from the Epic Games Launcher
Sign in to your Fortnite or Epic account if prompted