Right-click the executable and select Run as Administrator to ensure it has the necessary permissions to save your progress.
Run the game using the desktop shortcut or the forza_x64_release_final.exe in the installation folder. File: Forza.Horizon.3-CODEX.zip ...
Copy all files from that folder and paste them into the main directory where you installed the game. Confirm "Replace files in the destination" when prompted. 4. Important Prerequisites Right-click the executable and select Run as Administrator
Inside the extracted folder, you will find a .iso file. On Windows 10 or 11, right-click it and select Mount . If you are on an older OS, use a tool like PowerISO . 2. Installation Run Setup: Open the mounted drive and run setup.exe . Choose Directory: Select your install location. Confirm "Replace files in the destination" when prompted
If you didn't check the box during setup, open the folder named CODEX inside the mounted ISO.
Right-click the .zip file and extract the contents using 7-Zip or WinRAR.